◎ 题干
           to nuclear radiation, even for a short time, may produce variants(变异)of genes in human bodies.  
[     ]
A. Having exposed    
B. Being exposed  
C. Exposed          
D. After being exposed
◎ 答案
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◎ 解析
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◎ 知识点
    根据n多题专家分析,试题“ to nuclear radiation, even for a short time, may produce variants(变异)of genes in human bodies.[ ]A. Having exposedB. Being exposedC. ExposedD. After bein…”主要考查了你对  【动名词的被动式】  等知识点的理解和应用能力。关于这些知识点的“档案”,你可以点击相应的链接进行查看和学习。