Saturday, 18 April 2020

SOLN - SC 1 - 18th April 2020


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1C

With the patience of its customers and with its network strained to the breaking point, the on-line service company announced a series of new initiatives trying to relieve the congestion that has led to at least four class-action lawsuits and thousands of complaints from frustrated customers.

(A) the patience of its customers and with its network strained to the breaking point, the on-line service company announced a series of new initiatives trying to relieve
(B) the patience of its customers and its network strained to the breaking point, the on-line service company announced a series of new initiatives that try to relieve
(C) its network and the patience of its customers strained to the breaking point, the on-line service company announced a series of new initiatives to try to relieve
(D) its network and with the patience of its customers strained to the breaking point, the on-line service company announced a series of initiatives to try relieving
(E) its network and its customers’ patience strained to the breaking point, the on-line service company announced a series of new initiatives to try relieving

After a quick glance over each option, only 2 major differences appear between each option:

1. The order of items in the beginning: customers + network / network + customers
2. Their endings: trying to relieve / that try to relieve / to try to relieve / to try relieving


#1 on our list will eliminate the most options quickly (either 2 or 3), so let's start there. Let's look at what each sentence means when we switch around the order of the customers and network:

With the patience of the customers and its network strained to the breaking point = the patience of the customers and the patience of its network

This is the WRONG option because it says that the patience of BOTH the customers and the network is strained, which doesn't make sense. The network is strained, but doesn't have the ability to be patient - it's not a person!

With its network and the patience of the customers strained to the breaking point = the network is strained and the patience of the customers is strained

This is the CORRECT option because it puts the emphasis on BOTH the network and the customers being strained, which is logical and true!

This means we can eliminate options A & B right away because they create an illogical parallel statement.

Now that we're left with only 3 options, let's tackle #2 on the list: their endings. For this, we need to know the difference between "to try to" and "try doing" something:

to try to do something = to put in an effort to do something you already know can be successful / "I want to try to learn the piano this year."
try doing something = to do something as an experiment; you're not sure it will be successful / "Try adding more salt to your cookie batter."

For this sentence, it makes the most sense to say that they company created initiative to try to relieve congestion because they know it's possible to do, but they just need to put in the effort. So let's see how each answer stacks up:

(C) its network and the patience of its customers strained to the breaking point, the on-line service company announced a series of new initiatives to try to relieve

This option is CORRECT because the beginning of the phrase is in the correct order to make sense. It also uses the correct "to try to," which conveys the correct meaning that the company has to put in an effort to fix the problem they know can be fixed.

(D) its network and with the patience of its customers strained to the breaking point, the on-line service company announced a series of initiatives to try relieving

This option is INCORRECT because it uses the phrase "to try relieving," which suggests that the company isn't sure their initiatives will be possible or even work. It's much stronger to say "to try to" do something because it shows that success is definitely possible.

(E) its network and its customers’ patience strained to the breaking point, the on-line service company announced a series of new initiatives to try relieving

This option is INCORRECT for a couple reasons. First, it's not necessary to use the apostrophe in "customers'" because it's not being followed by a plural word (for example "customers' chairs" would be okay). It also uses the incorrect "to try relieving" which conveys the wrong meaning.

There you have it - option C is the correct answer!

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2A

Quote:
(A) extinction; its numbers are now five times greater than

Two things jump out at me right away in (A), and neither of them are a problem. First, the semicolon needs to separate two independent clauses, and it does exactly that. Second, the “its” needs to refer back to a singular noun, and it does exactly that – “its” refers to “the gyrfalcon.”

So I wouldn't eliminate (A) right away. But it is awfully similar to (B), so let’s put them side-by-side:
Quote:
(A) extinction; its numbers are now five times greater than
(B) extinction; its numbers are now five times more than

The only difference is that (A) uses the phrase “greater than”, and (B) uses “more than.” In real life, I don’t think that either of these necessarily sounds better than the other, and I probably wouldn't notice if somebody said the incorrect version.

Here’s the thing: if you’re comparing numbers themselves – not quantity in general, but actual numbers – it’s generally better to use “greater than” instead of “more than.” For example, you would read the mathematical expression 20 > 10 as “twenty is greater than ten.”

Or you consider the following two sentences:
  • I ate more burritos than Mike last night. → we’re comparing quantities of burritos in general, not the numbers themselves, so “more” is OK
  • I ate a greater number of burritos than Mike last night. → now that we’re comparing the numbers, we need to use “greater”
  • I ate a more number of burritos than Mike last night. → not remotely tempting to use “more” to compare the numbers themselves in this case, right?

Back to the GMAT question. Since we’re directly and literally comparing the numbers themselves, we need to use “greater than”, and not “more than”.

So we can eliminate (B), and hang onto (A).

Quote:
(C) extinction, their numbers now fivefold what they were

Hopefully, the pronouns jump right off the page at you. “Their” needs to refer to a plural noun, and… well, we don’t have any plurals earlier in the sentence. “The gyrfalcon” is singular.

So (C) is out.

Quote:
(D) extinction, now with fivefold the numbers they had

(D) has a similar problem as (C): there’s some general awkwardness, but the much more important issue is that “they” doesn’t have a logical referent. The only plural noun earlier in the sentence is “the numbers”, and that definitely wouldn’t work: “… now with fivefold the numbers the numbers had…” Yikes. Of course, “they” is logically trying to refer to “the gyrfalcon”, and that’s singular.

So (D) is gone, too.

Quote:
(E) extinction; its numbers are now five times greater than what they were

(E) is just a crappier version of (A). The only real difference is that (E) adds the phrase “what they were” to the end of the sentence, and there’s no good reason to do that – it adds nothing to the meaning, and just makes the sentence wordier and messier.

We can eliminate (E), and (A) is the best we can do.

ALTERNATIVE EXPLANATION 

When you are comparing two nouns, the focus is on the nouns and not on the actions. For example:
John is taller than his brother . We don not say John is taller than his brother is. Because the comparison is just between two nouns namely John and his brother and not how tall both are.

However, look at this now.

John jumps higher than his brother- This is wrong; Here we are comparing John’s jumping with his brother‘s jumping, a comparison of two actions and hence both the actions must be explicitly stated.

In the given case, the numbers of the previous times are being compared with the numbers of the present time – essentially a comparison of two nouns. Hence, we can afford to drop the verbal comparison.

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3A

Although the rise in the Producer Price Index was greater than expected, most analysts agreed that the index was unlikely to continue going up and that inflation remained essentially under control.

A. that the index was unlikely to continue going up and that inflation remained
B. that it was unlikely for the index continuing to go up and for inflation to remain
C. that the index was unlikely to continue to go up, with inflation to remain
D. on the unlikelihood that the index would continue going up and that inflation remained
E. on the unlikelihood that the index would continue to go up and for inflation to remain

After a quick scan over the options, a few key differences jump out:

1. that / on the unlikelihood that
2. continue / continuing / would continue
3. that / for / with
4. remained / to remain


If we look more carefully at the sentence, we can spot what type of question this is:

Although the rise in the Producer Price Index was greater than expected, most analysts agreed that the index was unlikely to continue going up and that inflation remained essentially under control.

When looking at the sentence as a whole, we see that the underlined portion contains the 2 things that analysts agree on - and those 2 things MUST be parallel! Any time you see a grouping of items, parallelism is a good place to start! Let's check each option to ensure the 2 items are parallel:

A. that the index was unlikely to continue going up and that inflation remained --> PARALLEL

B. that it was unlikely for the index continuing to go up and for inflation to remain --> NOT PARALLEL

C. that the index was unlikely to continue to go upwith inflation to remain --> NOT PARALLEL

D. on the unlikelihood that the index would continue going up and that inflation remained --> NOT PARALLEL

E. on the unlikelihood that the index would continue to go up and for inflation to remain --> NOT PARALLEL

There you have it - option A is the only one that uses parallel structure for both items! If you can identify what type of SC question you're dealing with, it is a lot easier to check for common mistakes (parallelism, modifiers, subject-verb agreement, etc.).


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4E

Choice A is incorrect because of modifier error.
"outnumbering her letters to anyone else" should modify the letters but its placement is such that it appears to modify the preceding clause.

Notice that comma + verb-ing modify the preceding clause. And this modification does not make sense here. This is because it was not because the letters were written in the specified period that these letters outnumbered the other set of letters. In fact these two actions - were written and outnumber are really two different characteristics of the letters.

Lets consider an example sentence:
The film was shot in a small town of Guthernberg, exceeding expectations of the producers.
This sentence is incorrect since the verb-ing modifier appears to modify preceding clause and in this sentence this modification does not make sense. The fact that the film was shot in a small town did not really lead to exceeding the expectations of the producers.

The correct sentence is:
The film, shot in a small town of Guthernberg, exceeded the expectations of the producers.

The sentence simply states a fact that this film exceeded the expectations. It does not provide any reasoning for the same.

The film received significant critical acclaim, exceeding the expectations of the producers.
This sentence is correct. In this sentence, the verb-ing modifier makes complete sense with the preceding clause. The expectations of the producers were exceeded by virtue of the film receiving significant critical acclaim.




5 A

"The original sentence successfully avoids the problems that may occur in a long sentence with multiple modifiers. Two subordinate clauses begin with "that", and one of them is contained within another


(A) that the economy will avoid the recession that many had feared earlier in the year and instead come

The question here is what is going to avoid the recession? Is it the economy or the confidence? If we realize that it is the economy that will avoid the recession, then the expression ‘in the economy’ becomes irrelevant. Thus A avoids the pitfall of multiple modifier sentences in which it will be difficult to fix which noun will be modified by which modifier. A seems to be better than B, C and D

b) How can one be sure that "come" is parallel with "avoid", and not with "reflect" of the main clause?,

The confidence does two things and those two things must be parallel. One is that the economy will avoid something and instead (will) come in for something. Reflect is a present tense plural verb and (will) come is a singular future tense verb as in ‘will avoid’. Please do not lose sight of the auxiliary verb ‘will’. So 'reflect' and 'come' are
not parallel.

C In B, why does "rather to come" is wrong

Pl lread in full - “According to some analysts, the gains in the stock market reflect growing confidence in the economy to avoid the recession, what many feared earlier in the year, rather to come in for a 'soft landing', followed by a gradual increase in the business activity.”

First part: The gains reflect confidence (in the economy) to avoid the recession
Second part: The gains reflect confidence (in the economy) to come in for soft landing

When OG says that ‘to come’ is not idiomatic, it may be meaning that ‘to come’, though grammatically parallel ‘to avoid’, is not the normal usage. Common usage is to describe it as ‘to avoid’ ‘but / instead come’, dropping the infinitive marker ‘to” in the second part.

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6B

Only B correct. You can see the non-underlined part "The prime lending rate is a key rate in the economy:............" Technically, after the colon, there is an explanation for the part before the colon. The sentence is about "the prime lending rate". <== KEY to solve this question.

The prime lending rate is a key rate in the economy: not only are the interest rates on most loans to small and medium-sized businesses tied to the prime, but also on a growing number of consumer loans, including home equity loans.

(A) not only are the interest rates on most loans to small and medium-sized businesses tied to the prime, but also on
Wrong.
- Parallelism problem: Not only [are the interest rates]...., but also on [a growing number of consumer loan].
- Meaning problem: A means only interest rates on loan to S&M business tied to the prime! How about consumer loan?. Keep in mind, the main subject of the sentence is "The PRIME lending rate" + colon ==> both business loans and consumer loans are tied to the prime.

(B) tied to the prime are the interest rates not only on most loans to small and medium-sized businesses, but also on
Correct.

(C) the interest rates not only on most loans to small and medium-sized businesses are tied to the prime, but also
Wrong.
- Parallelism problem: Not only on,....but also..........(without "on")

(D) not only the interest rates on most loans to small and medium-sized businesses are tied to the prime, but also on
Wrong.
- Parallelism problem: Not only [the interest rates] on most loan...., but also on [a growing number of consumer loan].
- Meaning problem: A means only interest rates on loan to S&M business tied to the prime! How about consumer loan. ==> Refer to the explanation on A.


(E) the interest rates are tied to the prime, not only on most loans to small and medium-sized businesses, but also
Wrong.
- Parallelism problem: Not only on,....but also..........(without "on")

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7B


(B) - wordy and awkward? Still better than "wrong answer."

I kinda understand about the "awkward and wordy" part.
On the other hand, if you are not sure about the word "hopefully"—and many people aren't—pick "hopefully" to eliminate,
as long as the "it is hoped" option seems grammatical otherwise.

Hopefully is an adverb, this way: He looked hopefully towards the horizon, waiting for sunrise.
Hopeful is the adjective. The hopeful sailors scanned the horizon for land.
In this question, who or what is doing something "hopefully" here (is doing something in a hopeful manner)?
The electromagnetic waves?
No. Although "hopefully" is okay in informal conversation and according to some grammarians,
all the time, the GMAT does not like hopefully unless it is attached to a person doing something with hope.
(I do not think I have ever seen an official question with "hopefully" in the correct answer.)

What if a test taker is not sure whether a word in one answer is correct and the other answer
sounds wordy and awkward?
Choose the "wordy" and "awkward" answer.
"Wordy and awkward" sentences aren't great. But they aren't wrong. ;)

• What do we call the construction or style in option B? That construction is called "splitting the verb"
You have asked a really hard question.
Style and rhetoric questions delve into difficult material. I have no doubt that you can handle it.

What you see is called "splitting the verb."

We split a helping (auxiliary) verb from the other verb and put an adverb or short adverbial phrase
to clarify, to emphasize, or to avoid awkward constructions.

Normally, adverbs in auxiliary verb-verb constructs come after the verb.
Correct: We have fixed that part already. [Do not fix that part again. Please fix a different part.]
For emphasis: We have already fixed that part. [So you should not fix it again. Please fix a different part.]
Also for emphasis: We already have fixed that part. [Before now, we fixed that part.]

In the emphasis cases, I split the auxiliary verb have from the verb fixed.
The word "already" gets the reader's or listener's attention.

Short phrases can also be inserted.
→ I just split the verb "can be" with "also" :)

In this case, "it is hoped" correctly splits the verb as I explain below.

One note of caution: splitting verbs with adverbs can produce confusion.

An excellent synopsis can be found HERE. The synopsis deals with splitting verbs,
as is done in "will, it is hoped, enable."
The article simplifies the whole topic and describes the possibility of confusion.

• Splitting the verb in this question

The auxiliary verb "will" is split from the main verb "enable" by the adverbial phrase it is hoped probably for two reasons:

1) to qualify, explicitly, an extraordinary assertion.
Think about seeing the formation of black holes!
The author wants to remind us that this event is not certain (clarity)
but very exciting (emphasis);
and
2) to maintain flow. Stylistically, the phrase does not work very well elsewhere.

• This phrase is common in academic English: will, it is hoped, VERB

The construction looks strange to many.
If you read enough stuffy or scientific literature, the phrase does not seem strange. (Guilty as charged.)
Other phrases that split verbs in formal prose include on occasion, in theory, and in reality.

Such splitting is allowed and often used to add particular emphasis or to avoid strange phrasing.

• Trying to move it is hoped creates problems
If we try to rewrite the sentence, to change the split verb, we run into problems.

• Rewrite #1. The sentence could be rewritten this way:

(1) It is hoped that the use of gravity waves, which do not present the problems that X do, will enable astronomers to study Y and Z.

The author wants to emphasize the importance of gravity waves' potential to allow human beings to witness the formation of black holes and neutron stars (Y and Z).
-- (S)he partly accomplishes her goal by keeping what astronomers will be able to study at the end of the sentence.
(In English, readers naturally stress the end of a sentence most of the time.)

-- The phrase's placement in (1), however, puts too much stress on "it is hoped."
There is too much stress on "it is hoped" because the sentence leads with a hypothetical—and one without an agent at that.

• So let's try a different placement of the adverbial phrase "it is hoped." Rewrite #2:

(2) The use of gravity waves, which do not interact with matter in the way electromagnetic waves do, will enable, it is hoped, astronomers to study Y and Z. :(

Unless the object is long or complex, an adverb should not intrude between a verb (enable) and the verb's object (astronomers).

Now the adverb "it is hoped" is clumsy and a buttinsky.

This writer wants to talk about radical horizons.
The connection between "enable" and astronomers" is blocked.
An adverb between verb and an object is often nonsensical.
IncorrectThe team rejected summarily him during the draft pick rounds.

• Let's move the phrase again. Rewrite #3

(3) The use of gravity waves, which do not interact with matter in the way electromagnetic waves do, it is hoped will enable astronomers to study the actual formation of black holes and neutron stars. :(

The author wants to focus on the potential for astronomers to study Y and Z.
(S)he has to qualify an assertion, but in this sentence the phrase disconnects the logical connection between waves and will enable.

Further, if we place it is hoped after the comma and before the auxiliary verb phrase, that placement suggests an antecedent of "it."
No such antecedent exists. "It" is a dummy placeholder.
The phrase draws unearned attention in this third case.

• We have a better choice of placement. The author qualifies an exciting assertion in the correct manner
by suggesting the uncertainty without harping on it.


The use of gravity waves, which do not interact with matter in the way electromagnetic waves do, will, it is hoped, enable astronomers to study the actual formation of black holes and neutron stars.
By way of rhetorical and syntactic effect, the reader discovers an exciting prospect.

This prospect (future, declarative) WILL, it is hoped, ENABLE.
Those two capitalized words draw our attention.

The placement of "it is hoped," between a declared future and a Good Thing,
allows us to absorb a sense of measured determination. That is, the scientists are confident about but not guaranteeing a result.

Black holes and neutron stars fascinate me.

Even with many commas in its sentence, the placement of "will, it is hoped, enable" mimics a human being who waits with bated breath to see the formation of a black hole.

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And if none of that explanation satisfies you, rely on POE. :-D
• Process of Elimination

Split #1: LIKE is incorrect

One cue comes from a phrase in Options A and B: in the way [that].
That very phrase is a good way to test whether we should use the word AS or LIKE (in options C and D).
If in the way that works, then the word like is wrong.
In comparisons, like is followed only by a noun and does not take a verb.
In the way that or describes actions—verbs!

Substitute "in the way that" for LIKE to see whether LIKE is correct.
If the sentence works with "in the way that," we are implying an action, and like should not be used.
C) . . . gravity waves, which do not interact with matter [in the way] electromagnetic waves, hopefully . . . [that substitution works. LIKE is wrong.]
D). . . gravity waves, which do not interact with matter [in the way] electromagnetic waves . . . [that substitution works. LIKE is wrong]

We have two cases of a Missing Verb.
We need AS electromagnetic waves DO.

Omit C and D

Split #2: SUCH AS is for examples, not for direct comparison.
The contrast is between gravity waves and electromagnetic waves. The latter are not an "example." The latter are the other item of comparison.
SUCH AS . . . electromagnetic waves DO is incorrect

Omit E

Split #3 - Hopefully is an adverb and things cannot act or behave hopefully.

The use of gravity waves . . . hopefully will enable
What, the gravity waves will be hopeful when they enable astronomers to witness the formation of black holes? I don't think so.
Worse, the use of the gravity waves will behave hopefully when that use helps? No.

CorrectI hope, they hope, scientists hope (verb)
CorrectI am hopeful about the future, scientists are hopeful about the prospect of learning more about black holes (adjective)
CorrectThe seasick tourist looked hopefully at the island towards which the boat was heading. (adverb)
Correctit is hoped

WrongThe use of gravity waves . . .hopefully will enable
-- Will the gravity waves enable in a hopeful way = hopefully?? NO
WrongThe use of gravity waves . . . would enable, hopefully.
-- The use of gravity waves will not help hopefully. A thing cannot do something in a hopeful manner = hopefully.

Incorrecthopefully in A, C, and E. (C and E are already gone)

Omit A.

The answer is B.


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8 E

Regulators are likely to end what are, in effect, long-standing exemptions permitting pilots of small turboprop aircraft at small carriers to fly as much as 20 percent more hours per month than pilots at larger airlines fly, with the consequence that some carriers could be forced to hire additional pilots.

A. as much as 20 percent more hours per month than pilots at larger airlines fly, with the consequence that
B. as many as 20 percent more hours per month as pilots at larger airlines, and
C. more hours per month, as much as 20 percent, than pilots at larger airlines; consequently
D. as much as 20 percent more hours per month as larger airlines’ pilots, so
E. as many as 20 percent more hours per month than pilots at larger airlines do, and consequently

After a quick scan over the options, there are a few things we can focus on to narrow down our choices:

1. as much as vs. as many as (Idioms)
2. than vs. as (Comparisons/Idioms)
3. how each option ends (Meaning/Punctuation/Conjunctions)


Let's start with #1 on our list: as much as vs. as many as. This is a common grammar issue people often get mixed up, so here is a quick lesson on when to use "as much as" versus "as many as":

as much as = non-countable nouns & percentages
That pair of shoes costs as much as my last month's rent!
The failure rate for this class can be as much as 25 percent.


as many as = countable nouns
There will be as many as 250 people at our graduation party.
My coworkers work as many as 15 percent more hours than I do each week.


So let's take a closer look at our options and eliminate the ones that don't use the correct idiom:

A. as much as 20 percent more hours per month than pilots at larger airlines fly, with the consequence that
B. as many as 20 percent more hours per month as pilots at larger airlines, and
C. more hours per month, as much as 20 percent, than pilots at larger airlines; consequently
D. as much as 20 percent more hours per month as larger airlines’ pilots, so
E. as many as 20 percent more hours per month than pilots at larger airlines do, and consequently

We can eliminate options A, C, & D because they don't use the correct "as many as" to refer to "hours," which are countable.

Now that we have it narrowed down to only 2 options, let's take a closer look at each one to find any other problems. Remember, we can look at "than/as" and how each option ends to determine if they create a clear and concise statement!

B. as many as 20 percent more hours per month as pilots at larger airlines, and
This is INCORRECT for a couple reasons. First, when comparing two items, we must use "X is more than Y," and not "X is more as Y." Second, the comparisons aren't parallel. This sentence compares the hours pilots at smaller carriers fly to pilots at larger airlines. Comparing hours flown to pilots isn't parallel - we must compare hours to hours!

E. as many as 20 percent more hours per month than pilots at larger airlines do, and consequently
This is CORRECT! It uses the correct idioms "as many as" and "X is more than Y." It also compares the hours that pilots at smaller carriers fly to the hours pilots at larger airlines fly, which is parallel.

There you have it - option E is the correct choice! If you can become familiar with common idioms and comparison rules, these types of questions are much easier to tackle on the GMAT exam when you spot them!


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9 E

Gusty westerly winds will continue to usher in a seasonably cool air mass into the region, as a broad area of high pressure will build and bring fair and dry weather for several days.

(A) to usher in a seasonably cool air mass into the region, as a broad area of high pressure will build and
(B) ushering in a seasonably cool air mass into the region and a broad area of high pressure will build that
(C) to usher in a seasonably cool air mass to the region, a broad area of high pressure building, and
(D) ushering a seasonably cool air mass in the region, with a broad area of high pressure building and
(E) to usher a seasonably cool air mass into the region while a broad area of high pressure builds, which will

After a quick glance over each option, there are a few major differences we can address that will help narrow our options down quickly:

1. to usher / ushering
2. into / to / in
3. conjunctions & punctuation after "region"
4. each option's ending


Let's look at #1 on this list first: to usher / ushering. This was a tough one for a lot of people, and for good reason! As it turns out, you can use both of these in this sentence and they'll work. If you find yourself stuck on to usher / ushering for too long, it's a good sign that you need to move on to something else on the list. You can always come back to it later if you need to!

Instead of staying stuck on #1 for too long, let's jump into #2 on the list: into / to / in. One thing that jumped out to me right away is that some options say "ushering/to usher in....into the region," which is redundant! You can usher something into a region, or usher in something to a region, but you cannot usher in something into a region! Let's see which options we can eliminate that are redundant:

(A) to usher in a seasonably cool air mass into the region, as a broad area of high pressure will build and
(B) ushering in a seasonably cool air mass into the region and a broad area of high pressure will build that
(C) to usher in a seasonably cool air mass to the region, a broad area of high pressure building, and
(D) ushering a seasonably cool air mass in the region, with a broad area of high pressure building and
(E) to usher a seasonably cool air mass into the region while a broad area of high pressure builds, which will

You can eliminate options A & B quickly because they are redundant.

This leaves us with only 3 options left, so let's focus on #3 and #4 on the list: conjunctions/punctuation after "region" & their endings. We need to make sure commas and conjunctions are being used correctly, and that the endings work with the rest of the sentence. Here's how each option breaks down:

(C) to usher in a seasonably cool air mass to the region, a broad area of high pressure building, and

This option is INCORRECT because the comma after "region" creates an awkward comma splice. It also doesn't work to say that high pressure is "building, and bring fair and dry weather..." because it's not parallel. It should be "building and bringing" for it to be parallel! It also says that ALL of the actions happen at the same time, which isn't accurate. First, the cool air mass comes in and builds pressure, and THEN fair and dry weather happens over the next several days.

(D) ushering a seasonably cool air mass in the region, with a broad area of high pressure building and

This option is INCORRECT because it uses the phrase "building and bring," which isn't parallel. We don't really have a problem using the comma before "with" in this case because it's being used to indicate that everything after it is non-essential information (which it is). The meaning of the sentence doesn't change if you take it out, so it's a non-essential phrase that merely adds colorful details. This sentence also suggests that ALL of the actions happen at the same time, instead of in a particular order.

(E) to usher a seasonably cool air mass into the region while a broad area of high pressure builds, which will

This option is CORRECT because it's not redundant (to usher...into the region), "while" is being used correctly to show two actions occur at the same time, and the conjunction "which will" properly shows that the action "bring fair and dry weather for several days" happens after the cool air mass shows up. This sentence is clear, concise, and shows the proper order of events!

There you go - option E is the correct answer, and hopefully we got to it quickly enough for you to tackle more GMAT questions in the allotted time!


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10E

The North American moose's long legs enable it to move quickly through the woods, stepping easily over downed trees, but predators pursuing it must leap or go around them.
1. ', stepping' wrongly modifies the legs
2. 'It' refers to the singular moose.
3. 'them' refers to the trees


(A) moose's long legs enable it to move quickly through the woods, stepping easily over downed trees, but predators pursuing it must leap or go around them -- stepping wrongly modifies the legs, rather than the moose.
(B) moose's long legs enable it to move quickly through the woods, stepping easily over downed trees while predators pursuing them must leap or go around -- 1. same modification problem as in A. 2. 'them' refers to plural animals rather than the singular moose.

(C) moose's long legs enable it to move quickly through the woods and to step easily over downed trees, but predators pursuing them must leap over or go around them -- 'them' has no antecedent.
(D) moose has long legs, enabling it to move quickly through the woods and to stop easily over downed trees while predators pursuing them must leap or go around -- 'them' is the problem
(E) moose has long legs that enable it to move quickly through the woods, stepping easily over downed trees while predators pursuing it must leap over or go around them --- 'it' correctly refers to the singular moose; 'them' refers to the plural woods--- correct choice.



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