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SC-Dinosaurs

by mankey » Wed Dec 14, 2011 8:26 am
Dear Experts

Please help.

A huge flying reptile that died out with the dinosaurs some 65 million years ago, the Quetzalcoatlus had a wingspan of 36 feet, believed to be the largest flying creature the world has ever seen.

(A) believed to be
(B) and that is believed to be
(C) and it is believed to have been
(D) which was, it is believed,
(E) which is believed to be

Thanks.
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by GMATGuruNY » Wed Dec 14, 2011 8:53 am
mankey wrote:Dear Experts

Please help.

A huge flying reptile that died out with the dinosaurs some 65 million years ago, the Quetzalcoatlus had a wingspan of 36 feet, believed to be the largest flying creature the world has ever seen.

(A) believed to be
(B) and that is believed to be
(C) and it is believed to have been
(D) which was, it is believed,
(E) which is believed to be

Thanks.
The present infinitive expresses contemporaneous action (an action happening at the same time as another action):

I am happy to be president.

In the sentence above, I am happy (in the present) to be president (also in the present).

The present perfect infinitive expresses past action:

I am happy to have been president.

In the sentence above, I am happy (in the present) to have been president (in the past).

In the SC above, the reptile no longer exists, so the present perfect infinitive is needed:

...the Quetzalcoatlus...is believed to have been the largest flying creature the world has ever seen.

The correct answer is C.
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