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  3. ______to nuclear radiation, even for a short time, may influence genes in human bodies.

______to nuclear radiation, even for a short time, may influence genes in human bodies.

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问题 ______to nuclear radiation, even for a short time, may influence genes in human bodies.
选项 A、Having exposed
B、Being exposed
C、To expose
D、Exposed
答案B
解析 考查非谓语动词。句意：暴露于核辐射中甚至很短时间都会影响人体的基因。该句中的谓语是may influence，even for a short time是插入语，“______to nuclear radiation”是主语，be exposed to表示“暴露于”，过去分词不可以直接充当主语，故用动名词being exposed to。故本题选B。
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