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    【题目】Scientists have advanced many theories about why human beings cry tears, none of ________ has been proved.

    A. which

    B. whom

    C. them

    D. who

    【答案】A

    【解析】考查定语从句。句意：关于人类为什么哭的时候会流泪，科学家已经提出了很多理论，没有一个被证明了。使用定语从句，先行词是theories，指物，定语从句中用代词+介词+关系代词which引导。故选A。

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