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【題目】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】考查定語從句。句意：關于人類為什么哭的時候會流淚，科學家已經提出了很多理論，沒有一個被證明了。使用定語從句，先行詞是theories，指物，定語從句中用代詞+介詞+關系代詞which引導。故選A。

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