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_____ to nuclear radiation, even for a s...

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

A. Exposed         B. Being exposed

C. Having exposed  D. After being exposed

 

B 【解析】 试题分析:考查动名词作主语。being exposed to nuclear radiation为动名词短语作主语。本句意为:暴露在核辐射下,甚至是一小会,都会导致人体内基因的变异。故选B。 【名师点睛】作主语的只能用不定式和动名词,当含有“被动”意义的动名词作主语时,应用being done。过去分词不能作主语。 考点:考查动名词作主语。  
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