________tonuclearradiation,evenfor

发布时间：2020-07-25 17:47:41

________ to nuclear radiation, even for a short time, may produce variants of genes in human bodies.A.Being exposedB.Having exposedC.ExposedD.After being exposed

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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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