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【题目】There is no way of knowing why one man makes an important discovery ________ another man, also smart, fails.

A.sinceB.whileC.asD.if

【答案】B

【解析】

句意:没有办法知道为什么一个人做出了重要发现,而另一个聪明的人却失败了。

考查连词,since 自从……以来;while 表对比,然而;当……时候; as当……时候,因为; if如果,根据句意一个人做出了重要发现,而另一个聪明的人却失败了,可知此处应该填表示对比的词,故选B

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