Source: Official Guide for GMAT Review 2016 Sentence Correction; #51

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Neuroscientists, having amassed a wealth of knowledge

Neuroscientists, having amassed a wealth of knowledge over the past twenty years about the brain and its development from birth to adulthood, are now drawing solid conclusions about how the human brain grows and how babies acquire language.

1 Explanation

2

Gravatar Mike McGarry, Magoosh Tutor

Aug 18, 2015 • Comment

pooja singh

what I think is that D and E are wrong cos they change the meaning in the sense that the main focus shifts from the second clause to the first. However, I don't think that "drawing " is modifying "adulthood" because present participial modifiers modify the whole preceding clause and not the touching noun. Please clarify.

Feb 23, 2018 • Reply

Sam Kinsman, Magoosh Tutor

You are right that D and E are wrong because they change the focus of the sentence. They are also grammatically incorrect.

In answer choice A, the phrase "are now drawing... language" is not a modifier. Instead, this phrase contains the sentence's main verb. The modifying phrase in the sentence is "having amassed... adulthood."

Let's try taking out the modifying phrase. The sentence becomes:

"Neuroscientists are now drawing solid conclusions about how the human brain grows and how babies acquire language."

This makes it easier to see why the phrase "are now drawing... language" is not a modifier.

Mar 1, 2018 • Reply

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Official GMAT Material

Official Guide for GMAT Review 2016

Official Guide for the GMAT 2015 14th Ed.

Official Guide for the GMAT 13th Ed.

Official Guide for the GMAT 12th Ed.

Revised GRE PDF 2nd Ed.


Section 9.6 Sentence Correction

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