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    【题目】_________to nuclear radiation, even for a short time, may produce variants of genes in human bodies.

    A. Being close B. Having been closed

    C. Closed D. After being closed

    【答案】A

    【解析】考查非谓语动词。句意：靠近核辐射，甚至在很短的时间，可能在人体内产生基因变异。分析句子结构，空格处是作主语，故要用动名词形式，故选A。

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