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to nuclear radiation, even for a short time, may produce variantsof genes in hum

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to nuclear radiation, even for a short time, may produce variantsof genes in hum

________ tonuclear radiation, even for a short time, may produce variants（变异体）of genes in human bodies.

A．Beingexposed

B．Havingexposed

C．Exposed

D．Afterbeing exposed

 

试题答案

答案：A

解析：

注意到这道题中有一个插入语“ever for a short time”，可先去掉以便分析句子，插入语前面的是主语，必须用非谓语动词，再根据句意可知必须用被动语态。

 

标签：timeshortmayvariantsofproduce

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