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There’s no way of knowing why one man makes an important discovery ________ another man, also intelligent, fails.
A.sinceB.ifC.asD.while
D
句意:没办法知道为什么一个人有重大发现,而另外一个人虽然也很聪明,却没有(重大发现)。此处while是并列连词,表示转折和对比,意思是“然而”。根据句意选D。
【考点定位】本题考查并列连词的用法。
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