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  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 whether引导让步状语从句时，通常与or连用，意为“不管……还是……”，例如：Whether you can see the moon or not，it is always round．不管你看见与否，月亮总是圆的。now that意为“既然……”，引导条件状语从句，从句内容是既成的事实，例如：Now that you will come here，I needn’t go there．既然你要来，我就没必要到那儿去了。as也可以引导让步状语从句，但是该从句一般置于主句之前，且从句内容必须倒装，例如：Much as he likes her，he does get irritated with her sometimes．尽管他喜欢她，可有时他确实也对她发火。Try as he would，he could not lift the rock．虽然他尽力了，但仍不能搬动那块石头。while除了引导时间状语从句外，还可以引导让步状语从句，作“尽管，虽然”讲，有着强烈的对比意味，例如：While I admit his good points，I can see his badones．虽然我承认他的优点，但我也能看得出他的缺点。
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考研英语一

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