题目内容
_____ 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
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题目内容
_____ 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