请教一道题限定date的从句引导

幸福的莹莹 · 发表于 2009-9-20 00:48:00

256.
(28362-!-item-!-188;#058&003003) (T-4-Q1 TS-7-41)

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

幸福的莹莹 · 发表于 2009-9-26 18:07:00

serendipityh · 发表于 2009-9-26 22:00:00

这是字典里的句子: Do you know the date when the house was built?
但是大多数句子都是at date

A. when it is known that humans made A错在句意修饰扭曲: 文中本来说在这个date时, 人制造工具; 而A 是在这个date时 it's know...

B. at which it is known that humans had made 和A 一样

DE不用说必错无疑

edwardloo · 发表于 2009-9-26 22:19:00

我选了C，但给的答案是E

TonyGe · 发表于 2009-9-26 22:23:00

我赞成 C，

serendipityh · 发表于 2009-9-26 23:54:00

prep 答案是C 破解的那个!!

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

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请教一道题限定date的从句引导