Scientists have advanced many theories about why human beings cry tears, none of ________ has been p_刷题宝

题干

Scientists have advanced many theories about why human beings cry tears, none of ________ has been proved.

A：which

B：whom

C：them

D：who

上一题下一题 0.0难度选择题更新时间:2019-12-19 06:04:30

答案(点此获取答案解析）

A

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