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标题: 求助啊～～～～～ [打印本页]

作者: Zeldaw 时间: 2007-2-24 23:01
标题: 求助啊～～～～～

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

我选的A，在GMAT CLUB 上看人讨论有不少选了C，新东方给的答案居然是E？！

呵呵，希望大家帮忙分析一下，汗..........

作者: pumpkin 时间: 2007-2-25 12:36
您这样的发贴，过几天，连自己都会找不到自己的帖子，因为标题都看不出是什么出处的什么题目。

作者: Zeldaw 时间: 2007-2-25 22:01

恩，不好意思，下次一定注意

未有人解答呢，顶一下

[此贴子已经被作者于2007-2-25 22:01:06编辑过]

作者: pumpkin 时间: 2007-2-26 05:16

点击帖子右下脚，“编辑”按钮，您可以编辑帖子，修改标题。

再次感谢！

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