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    【题目】（2016·浙江）Scientists have advanced many theories about why human beings cry tears, none of ________has been proved.

    A. whom B. which

    C. what D. that

    【答案】B

    【解析】试题句意：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B。

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