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Scientists in Princeton have broken the speed barrier posed

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Scientists in Princeton have broken the speed barrier posed [#permalink] New post 16 Sep 2010, 07:16
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A
B
C
D
E

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  5% (low)

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0% (00:00) correct 100% (00:41) wrong based on 6 sessions
Scientists in Princeton have broken the speed barrier posed by light AND CAUSED A LIGHT PULSE TO TRAVEL AT MANY TIMES THE SPEED OF LIGHT.
(a) ...
(b) and have caused light pulses to travel at many times the speed of light.
(c) and has caused a light pulse to travel at many times the speed of light
(d) and caused light pulses to travel at many times the speed of light
(e) and have enabled a light pulse to travel at many times the speed of light

Only answers are unwelcome, do specify your rational.
[Reveal] Spoiler: OA
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Re: Scientists [#permalink] New post 16 Sep 2010, 07:35
A

past tense is sufficient to convey the information. this narrows down to a or d. in d, the answer refers to pulses instead of pulse.
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Re: Scientists [#permalink] New post 16 Sep 2010, 09:38
Hi,
DOn't you think it is more parallel when you have "Scientists have broken.....and have caused" ?

SO I picked B. PLease explain.
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Re: Scientists [#permalink] New post 16 Sep 2010, 09:58
to tell you the truth I cant see any difference between A B D except for the singular and plural in ( Pulse/Pulses), I have never faced a GMAT question where the split falls into just this.
Can you tell us the source of this question?, because I really doubt that on the GMAT this will be the only split, there is always other errors where we can sink our teeth into and reach the right answer.
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Re: Scientists [#permalink] New post 16 Sep 2010, 10:21
Agree with elevinty.Source please.
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Re: Scientists [#permalink] New post 17 Sep 2010, 08:32
Dreamy wrote:
A

past tense is sufficient to convey the information. this narrows down to a or d. in d, the answer refers to pulses instead of pulse.


actually in A the verb is not past tense, it is present perfect, it's just that HAVE is omitted otherwise the sentence would not be parallel and wrong.
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Re: Scientists   [#permalink] 17 Sep 2010, 08:32
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Scientists in Princeton have broken the speed barrier posed

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