【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(guān)于人類為什么哭的時(shí)候會(huì)流淚，科學(xué)家已經(jīng)提出了很多理論，沒有一個(gè)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(guān)系代詞which引導(dǎo)。故選A。

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