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本贴相关题目 GMATPrep-2008E1-SC-256 | TN-12-SC-1 (XWHK)

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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.

Awhen it is known that humans made
Bat which it is known that humans had made
Cat which humans are known to have made
Dthat humans are known to be making
Eof humans who were known to make

正确答案: C

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GMAT-6-41请教求解思路

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楼主

发表于 2005-11-11 16:04:00 | 只看该作者

GMAT-6-41请教求解思路

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.

when it is known that humans made

at which it is known that humans had made

at which humans are known to have made

that humans are known to be making

of humans who were known to make

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同意！

看一下！

Mark一下！

沙发

发表于 2005-11-11 17:33:00 | 只看该作者

c

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同意！

看一下！

Mark一下！

板凳

发表于 2006-8-23 14:03:00 | 只看该作者

那个方框框是怎么弄出来的？ =.=

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同意！

看一下！

Mark一下！

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