【題目】（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】試題句意：關(guān)于人類(lèi)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(méi)有一個(gè)被證明了。使用定語(yǔ)從句，先行詞是theories，指物，定語(yǔ)從句中用“代詞+介詞+關(guān)系代詞which”引導(dǎo)。故選B。

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