Almost the only evidence of the presence of human beings on : GMAT Sentence Correction (SC)
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Almost the only evidence of the presence of human beings on

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Senior Manager
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Almost the only evidence of the presence of human beings on [#permalink]

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14 May 2005, 03:57
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Almost the only evidence of the presence of human beings on the earth
for a period longer than half a million years are vast quantities of stone tools.

(A) longer than half a million years are
(B) of more than half a million years are
(C) of more than half a million years is
(D) lasting longer than half a million years is
(E) of longer than half a million years are
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14 May 2005, 04:08
is/are 2/3 split eliminates C and D.

Between A,B, and E, E is definately out.

Torn between A and B, I`m going with B because a period of more than... sounds idiomatic.
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14 May 2005, 05:38
C. singular subject (the only evidence) needs singular verb is..
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14 May 2005, 08:22
First thing is to figure out the is/are distinction.

The evidence is vast. or The evidence are vast

Clearly the correct to be verb = "is".

So its between C and D.

I would go with D. Cant explain why.
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14 May 2005, 09:03
What's the criterion for choosing C over D?
Is D wordy?
I picked D when I read the question.
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14 May 2005, 09:44
thearch wrote:
What's the criterion for choosing C over D?
Is D wordy?
I picked D when I read the question.

a period is from point X in time to point Y - so IMO, it cannot last longer, it can just be more or less!
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14 May 2005, 23:46
OA is D.

Almost the only evidence of the presence of human beings on the earth
for a period of more than half a million years is vast quantities of stone tools.

Almost the only evidence of the presence of human beings on the earth
for a period lasting longer than half a million years is vast quantities of stone tools.

I am not sure of the criteria to choose D to C. Can someone please explain?
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15 May 2005, 00:08
I will try. I got C on the first try as well.

the word period is there wheather we like it or not, so if we say 'for a period of more than a million years', than this sentence becomes awkward - it's better to say 'for more than a million years'. The same is true for A by the way, you can remove 'period' from there too.

However, if we have 'lasting' than period becomes a necessary word.

So the whole point of this excersise is to justify presence of 'period' in that sentence, isn't that wierd?

Any thoughts?
15 May 2005, 00:08
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