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GMATT73
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Yet another OG counterfeit.

OA is A

OE:

Look for pronouns in the underlined part of the sentence. They indicates that pronouns are likely being tested.

Rule and Fix:
A Pronoun must clearly and correctly refer to only one thing and must agree in gender and number with that thing. They clearly refers to and agrees with Archeologists.

POE:
All choices use they so nothing can be eliminated.

Chunk and Compare:
Compare A and B use assume to be the other choices use assume is. This is an idiom hopefully you have memorized this idiom. The correct idiom is assume to be.

Eliminate B, C, and D.

Compare A to E.
E uses the pronoun it but A does not. Since it should refer to bones it should be plural. Reread your choice:
Choose A.
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GMATT73
Archeologists in the Sudan have unearthed a bone of a mammal, one they assume to be of a genus rarely found on the continent of Africa.


(A) they assume to be of
(B) they assume that is of
(C) they assume that is
(D) that they assume is
(E) that they assume it to be


I agree with A.

Since the modifier 'one' is already present, we do not need another modifer 'that'. So D and E are out

A is idiomatic with 'assume to be'



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