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 状语从句。此处应该是一个让步状语从句，所以选择while。whether引导名词性从句，意为“是否”；now that表示“既然”，引导条件状语从句；as可以引导时间和让步状语从句，但用法与while不同。
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