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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
考查并列连词。根据句意,前后两句话为两种情况的对比“为什么一个人会做出一个重要的发现,而另一个人,也很聪明,但是失败了。”并列连词while表示对比。故选D。
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