to nuclear radiation, even for a short time, may influence genes in human bodies.
A. Exposed
B. Being exposed
C. To expose
D. Having exposed
网友回答
A. Exposed
(答案→)B. Being exposed
C. To expose
D. Having exposed
解析：考查动名词做主语，分析句子成分发现even for a short time, 是插入语，may influence是谓语，前面的部分应该是主语，be exposed to“暴露于”，要用动名词Being exposed to，句意是：暴露于核辐射中甚至很短时间都会影响人体的基因。选B。