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According to scientists at the University of California, the [#permalink]
07 Apr 2013, 08:09
38% (01:48) correct
62% (00:32) wrong based on 13 sessions
According to scientists at the University of California, the pattern of changes that have occurred in human DNA over the millennia indicate the possibility that everyone alive today might be descended from a single female ancestor who lived in Africa sometime between 140,000 and 280,000 years ago.
(A) indicate the possibility that everyone alive today might be descended from a single female ancestor who
(B) indicate that everyone alive today might possibly be a descendant of a single female ancestor who had
(C) may indicate that everyone alive today has descended from a single female ancestor who had
(D) indicates that everyone alive today may be a descendant of a single female ancestor who
(E) indicates that everyone alive today might be a descendant from a single female ancestor who
OA is D..... If OA is D, I think the sentence must be " the pattern of changes that has ocurred ....." indicates that .....
If the non underlined portion reads "the pattern of changes that have occurred... may indicate that" ...because have & indicate are plural.
If subject is pattern and if its singular, has is correct. OA is D If subject is changes and if its plural, have is correct. OA is C
I think the confusion about have or has is not required in this context because, have is the correct verb, since it is not underlined. (that is why we require to underline the relevant portion so that it always stands before our eyes.). The object of the preposition changes is the subject of that verb. The logical sequence therefore is to identify the main clause and its partner verb. This will lead us to identity 'pattern' as the subject of the main clause , which is singular and thereby the singular verb indicates The verb is rather a little away after the subordinate clause. So D is undisputable choice . C also has problem in the use of past perfect as the past perfect is simply dangling without the accompaniment of a simple past to logically pinpoint the timeline
The key thing I always do with any sentence is to establish what the 'main' part of it is . This should always have a subject (noun) and verb identifying those in pretty much every gmat sentence is a god place to start....
Former GMAT Pill student, now on staff. Used GMATPILL OG 12 and nothing else: 770 (48,48) & 6.0