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choice A puts the events in proper perspective: * The comet disintegrated last year; this was a one-time event. * It provided new insights. Since it was a one-time event, it's appropriate to say 'provided' (simple past tense), unless the same event has CONTINUOUSLY provided newer and newer insights, in which case 'has provided new insights' would be better. But there's no indication of the latter in this sentence. * The 'forcing' is a possible future event.
Re: The spectacular disintegration of a comet [#permalink]
07 Nov 2011, 18:01
We should study gmatprep questions carefully because gmatprep is the only official source of hard questions. Study of questions from other source should be delayed.
in D and E, "last year", adverbial, is replaced and distorts the meaning. This error, replacement of adverbial, is popular in the question all of which or much of which is underlined and in which word difference can not help to show error.
BUT WHY IS C WRONG? , I do not understand. pls, help