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    精英家教网 > 高中英语 > 题目详情
    There’s 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：句意：没有办法知道为什么一个人取得重大发现，而另一个人，也很聪明，却不能。since 自从if   如果as 像…… 一样 while 而，却，引导并列句，符合题意，选D。
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