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单选题
Since 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

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参考解析
解析：
句意：尽管人类现在能创造出放射性元素,却无法降低它们的辐射。while在本句中引导让步状语从句，意为“尽管，虽然”，连接两个对比意味强烈的句子。as引导让步状语从句时，从句须倒装。whether引导让步状语从句时，常与or连用，意为“不管…还是…”。now that引导条件状语从句，从句内容是既成的事实，意为“既然…”。
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