There is no way of knowing why one man makes an important discovery another man, also intelligent, fails.A. since B. if C. as D. while 题目和参考答案——青夏教育精英家教网—

题目内容

There is no way of knowing why one man makes an important discovery ______ another man, also intelligent, fails.

A. since B. if C. as D. while

【解析】

试题分析：考查连词辨析。A. since因为；B. if 如果；C. as因为；D. while 然而。句意：无法知道为什么一个人有了一个重要发现，而另一个人，同样聪明，却失败了，”“while”是“而，却，但是”的意思，表示转折故选D项。

考点 : 考查连词辨析

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