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    【题目】There's no way of knowing why one man makes an important discovery ________ another man, also intelligent, fails.
    A.since
    B.if
    C.as
    D.while

    【答案】D
    【解析】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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