26.______ to nuclear radiation, even for a short time, may produce variants(变异体

Question

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

A. Being exposed B. Having exposed C. Exposed D. After being exposed
答案选A 求翻译+详解

Answer 1

这么多字 不会查字典吗追问

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