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Scientists have dated sharp-edged flakes of stone found in

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VP
Joined: 26 Apr 2004
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Location: Taiwan
Scientists have dated sharp-edged flakes of stone found in [#permalink]

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18 Jan 2005, 10:08
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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

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
Posts: 606

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18 Jan 2005, 10:28
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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Intern
Joined: 16 Jan 2005
Posts: 28

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18 Jan 2005, 18:14
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
Joined: 06 Sep 2004
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19 Jan 2005, 07:42
I also like A. What is wrong with A? And is it proper to say "..date at which humans are known to have made"?

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VP
Joined: 26 Apr 2004
Posts: 1208

Kudos [?]: 818 [0], given: 0

Location: Taiwan

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20 Jan 2005, 04:01
excuse me

Cound anybody know why A is wrong?

Thanks

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SVP
Joined: 03 Jan 2005
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21 Jan 2005, 16:06
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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Manager
Joined: 25 Oct 2004
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21 Jan 2005, 20:29
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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27 Jan 2005, 22:16
Pick bt B and C for "at which". And (C) for "human's are known" vs "it is known".

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Director
Joined: 05 Jul 2004
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30 Jan 2005, 18:10
chunjuwu..

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30 Jan 2005, 18:10
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