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VP
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Scientists have dated sharp-edged flakes of stone found in [#permalink]
 18 Jan 2005, 10:08
Question Stats:
0% (00:00) correct
 0% (00:00) wrong based on 0 sessions
Scientists have dated sharp-edged flakes of stone found in the fine-grained sediments of a dry riverbed in the Afar region of Ethiopia to between 2.52 and 2.60 million years ago, pushing back by more than 150,000 years the earliest date when it is known that humans made stone tools.
A) when it is known that humans made
B) at which it is known that humans had made
C) at which humans are known to have made
D)that humans are known to be making
E) of humans who were known to make
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Director
Joined: 31 Aug 2004
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I choose C too
A "it is know" is awkward, tense is not appropriate
B : exactly the same
C : sounds ok
D : that refers to date, improper tense
E : weird
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Manager
Joined: 16 Jan 2005
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out of the five C sounds relativley good.
But can someone explain if "Date at which" is idiomatic ..it just didn't sound too good to me.
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Manager
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I also like A. What is wrong with A? And is it proper to say "..date at which humans are known to have made"?
Please explain.
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VP
Joined: 26 Apr 2004
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excuse me
Cound anybody know why A is wrong?
Thanks
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SVP
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I'd choose C too. I think "at which" is preferable to "when". Humans are known to be doing something also sounds better than it is known that humans does something.
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Senior Manager
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C for me too. " when " in A sounds awkward. C seems right when put back in the original statement.
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SVP
Joined: 03 Jan 2005
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Pick bt B and C for "at which". And (C) for "human's are known" vs "it is known".
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Director
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chunjuwu..
OA and OE please.... 
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