专四

单选题 ______man can now create radioactive elements, there is nothing he can do to reduce their radioactivity．

A．As
B．Whether
C．While
D．Now that

参考答案：C进入在线模考
C。人类目前虽然能够创造放射性元素，却不能减少它们的放射性。
考查状语从句。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意为“既然”，引导原因状语从句；as可以引导时间状语从句和让步状语从句，但用法与while不同。

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