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_______ to nuclear radiation, even for a short time, may produce variants of genes in human bodies.

[  ]
A.

Being exposed

B.

Having exposed

C.

Exposed

D.

After being exposed

答案:A
解析:

本题考查非谓语动词作主语。能作主语的只有不定式和动名词,所给选项只有A项符合题意。


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