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    There is no way of knowing why one man makes an important discovery ______ another man, also intelligent, fails.
    A．sinceB．ifC．asD．while
    D               

    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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