选择题：___________man can create radioactive elements, there is nothing he can do to re

题目内容：

___________man can create radioactive elements, there is nothing he can do to reduce radioactivity.

A.As

B.Whether

C.While

D.Now that

参考答案：

答案解析：

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Sometimes I really doubt whether there is love between my parents. They are very busy working to 16

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