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GMAT Sentence Correction
10 Practice Questions  
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Question 1

Upon appearing first as a tiny speck in the night sky, some comets can eventually grow quite large in appearance.
 
(A)  Upon appearing 
(B)  Appearing 
(C)  The appearance of 
(D)  When appearing 
(E)  To appear 

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Analysis

The correct response is (B). In the original version (A), the word upon confuses the meaning of the sentence, by suggesting nonsensically that comets grow large in appearance immediately—as soon as they appear as a tiny speck. (B) is concise and clears up the confusion created by upon in the original version.

(C) is nonsensical.

(D) is no better than the original version. The word when, like upon, confuses the meaning of the sentence.

(E) is nonsensical.