2. 外语
  3. ______ man can now create radioactive elements, there is nothing he can do to reduce their radioactivity.

______ man can now create radioactive elements, there is nothing he can do to reduce their radioactivity.

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问题 ______ man can now create radioactive elements, there is nothing he can do to reduce their radioactivity.
选项 A、As
B、Whether
C、While
D、Now that
答案C
解析
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