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 Post subject: GMAT Verbal
PostPosted: Fri Jun 21, 2013 7:42 am 
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A piece of limestone discovered in sedimentary deposits near Gubbio, Italy, in 1979 provided the first evidence that the extinction of dinosaurs has possibly been caused by a meteorite impacting

A. hat the extinction of dinosaurs has possibly been caused by a meteorite impacting
B. that the extinction of dinosaurs may have been caused by a meteorite impact
C. of the extinction of dinosaurs being caused by the impact of a meteorite
D. of how possible it is that the extinction of dinosaurs could have been caused by a meteorite impact
E. that the cause of the extinction of the dinosaurs may been caused by a meteorite impact


(B) This question tests verb tense. Because dinosaurs became extinct long ago, any answer choice implying that the event happened recently, or is still going on, must be incorrect. Choice (A), using the phrase “has possibly been,” suggests that the extinction of dinosaurs was, until recently, an ongoing activity; and choice (C), using the phrase “being caused,” suggests that the extinction of dinosaurs is still occurring. Choice (E) contains several severe errors. Choice (D), while using the correct tense, employs wordy, awkward construction (“of how possible it is”). Choice (B), the best choice, is free of grammatical and stylistic errors.
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The Choice B seems to have the S-V number error. The Extinction of Dinosaurs may HAVE been caused. I think, we need 'HAS' here compared to 'HAVE' It should modify 'Extinction' which is singular. Please advise.


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 Post subject: Re: GMAT Verbal
PostPosted: Fri Jun 21, 2013 7:43 am 
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Explanation C: The passive voice "being caused" is far from ideal. Equally far from ideal would be the perfect passive "having been caused."


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