Five hundred million different species of living creatures : GMAT Sentence Correction (SC)
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# Five hundred million different species of living creatures

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Manager
Joined: 22 Feb 2007
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Five hundred million different species of living creatures [#permalink]

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26 Mar 2007, 09:14
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Five hundred million different species of living creatures have appeared on Earth, nearly 99 percent of them vanishing.

A. Five hundred million different species of living creatures have appeared on Earth, nearly 99 percent of them vanishing.

B. Nearly 99 percent of five hundred million different species of living creatures that appeared on Earth have vanished.

C. Vanished are nearly 99 percent of the five hundred million different species of living creatures that appeared on Earth.

D. Of five hundred million different species of living creatures that have appeared on Earth, nearly 99 percent of them have vanished.

E. Of the five hundred million different species of living creatures that have appeared on Earth, nearly 99 percent have vanished.
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26 Mar 2007, 13:12
Between B and E, I'll pick B. E appears to be convoluted.
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26 Mar 2007, 17:40
A. Five hundred million different species of living creatures have appeared on Earth, nearly 99 percent of them vanishing. What does "them" refer to? It's a run-on sentence.

B. Nearly 99 percent of five hundred million different species of living creatures that appeared on Earth have vanished. This sentence correctly uses past tense to place species on the planet and then present perfect to indicate that the species gradually vanished after appearing.

C. Vanished are nearly 99 percent of the five hundred million different species of living creatures that appeared on Earth. This is a "flipped" awkward sentence. Incorrect.

D. Of five hundred million different species of living creatures that have appeared on Earth, nearly 99 percent of them have vanished. "them" here is unnecessary.

E. Of the five hundred million different species of living creatures that have appeared on Earth, nearly 99 percent have vanished. Since the species had to appear before vanishing, the use of present perfect in both phrases is incorrect.
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26 Mar 2007, 20:16
Good explanation nervousgmat....

OA is indeed B.
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26 Mar 2007, 20:33
1100 + hits in less than 12 hours...
this post should get nominated to Guinness book of World Records
26 Mar 2007, 20:33
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