T.T..亲爱的斑斑们，饭饭知道这是道SC题目，但是饭饭是有一点“逻辑含义错误点”被困住，来逻辑区跪求大牛的~~所以..求求斑斑们表把饭饭的帖子搬运到SC区...求求咯... prep08-part1-256. (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 A. 关系代词用when和at which都是可以的；此选项表达的意思是 A fact is known at the earliest date，逻辑含义错误。
C. Correct；the earliest date at which humans are known to have made stone tools.=humans are known to have made stone tools at that date (the earliest date) – AlienX. 问题：“此选项表达的意思是A fact is known at the earliest date，逻辑含义错误。”为什么错了？？？
求各位NN们指教哇~~~~~~m(_ _)m...............NN们下凡吧......... -- by 会员 泾渭不凡 (2012/4/11 16:36:01)
prep笔记这解释很切中要害：
(A) the date when it is known that ...
For example, I would say
The date when it is known that genetic mutation causes cancer is some time in the 1980s.
I mean: In 1980s, scientists made a discovery that genetic mutation causes cancer. In other word, "some time in the 1980s" is the date for the discovery itself.
(C) the date at which humans are known to have made
The logic here is correct: we are interested in the date at which humans made stone tools, not interested in the date of scientific discovery.
以上算回答饭饭首贴的疑问。suri的解释和链接很赞，谢谢~ | 
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发表于 2012-4-11 16:36:01
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楼主
不对。。。貌似还是需要回到语法区哎。。o(╯□╰)o哦
。。
发表于 2012-4-12 05:31:49
