【題目】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】考查定語(yǔ)從句。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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