题目内容
【题目】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】考查定语从句。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A。
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