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# A newly released study on the tectonic plates forming the Pacific basi

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Manager
Joined: 08 Jan 2018
Posts: 223
Location: United States (ID)
GPA: 3.33
WE: Accounting (Accounting)
Re: A newly released study on the tectonic plates forming the Pacific basi  [#permalink]

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15 Jan 2018, 23:37
So, there is no grammatical errors or nothing is illogical with E.
the style and usage makes E vulnerable.
Director
Joined: 26 Aug 2016
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Re: A newly released study on the tectonic plates forming the Pacific basi  [#permalink]

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10 Jul 2018, 20:58
1
aaba wrote:
So, there is no grammatical errors or nothing is illogical with E.
the style and usage makes E vulnerable.

By 4999999 A.D, The sun will have become a red giant.

Did you observe the future perfect here?
The same should be used in the sentence too when we use the wording "by the time xxxx in the future".

That's why E is wrong for grammatical reasons.

I choose E at start. But later observed that there are illogical as well as grammatical errors in E.
Illogical: Home to ...., by the time ..., It is as if the by the time .. is modifying the clause they become home to.- It is ambiguous. illogical.
Grammatical reason: As stated above, We require future perfect.

Hope it helps.

+kudos if you like it.
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Re: A newly released study on the tectonic plates forming the Pacific basi  [#permalink]

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15 Sep 2018, 03:07

Official Explanation

A question about tectonic plates and climate change.

Notice that this is about a study making a prediction.

This sentence uses a particular idiom:

[place] “is home to” [thing]

“Rome is home to the Flavian Amphitheatre.”

“Georgia is home to Stone Mountain.”

“Cooperstown, NY, is home to the Baseball Hall of Fame.”

Variants, such as “is the home of” or “is a home to,” are awkward and incorrect.

Choice (A): The past perfect verb tense “had shifted” is not consistent with a prediction. This choice is incorrect.

Choice (B): The use of the future tense “will have” is incorrect. This choice makes an idiom mistake: “a home of.” Finally, this choice has a “due to” mistake: the phrase “due to” cannot modify the action of a verb. For a variety of reasons, this choice is incorrect.

Choice (C): This choice correctly uses “by the time they have shifted” in the prediction. Everything is organized clearly.

Choice (D): This choice also commits a “due to” mistake, trying to modify a verb. The pronoun “they” at the end is intended to refer to “tectonic plates,” but this antecedent is too far away and the pronoun seems to refer illogically to “major world cities.” This choice is incorrect.

Choice (E): This choice makes an idiom mistake: “is the home.” This entire phrasing is awkward and indirect because there is so much stuff between the subject “percentage” and the verb “will become.” This choice is incorrect.

The only possible answer is (C).
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Simple strategy:
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Re: A newly released study on the tectonic plates forming the Pacific basi  [#permalink]

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29 Sep 2018, 10:32
mikemcgarry please explain the verb tense in option C.

i dont really understand the verb tense arrangement here, " have shifted " present perfect is used mostly for things that happened in the past with their effect still present.

GMATNinja @DimitryFarber
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Re: A newly released study on the tectonic plates forming the Pacific basi  [#permalink]

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29 Sep 2018, 22:41
AdityaHongunti You're right about the present perfect ("have shifted"), but it can even be used to describe things that WILL HAVE BEEN ongoing at some specified point in the future: "By the time my grandchildren have all graduated from college, I will have been teaching the GMAT for 70 years."
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Intern
Joined: 30 Jun 2017
Posts: 8
GMAT 1: 670 Q50 V29
Re: A newly released study on the tectonic plates forming the Pacific basi  [#permalink]

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30 Sep 2018, 17:25
Bur sir "already" is an adverb , so it should modify become , a verb. This way option b seems to be the right answer.
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Re: A newly released study on the tectonic plates forming the Pacific basi  [#permalink]

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30 Sep 2018, 21:46
With a complex verb phrase such as "will have become," there are no such easy answers. One might just as easily argue (or one might argue just as easily) that we should say "will already have become." In fact, I'd argue that "will already have become" is better than what we see in B and C.
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Re: A newly released study on the tectonic plates forming the Pacific basi   [#permalink] 30 Sep 2018, 21:46

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