题目内容
__________to nuclear radiation,even for a short time,may produce variants of genes in human bodies.?
A.Being exposed
B.Having exposed ?
C.Exposed
D.After being exposed?
A
本题考查非谓语动词作主语。能作主语的只有不定式和动名词,所给选项只有A项符合题意。
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______ 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 |
____ to nuclear radiation, even for a short time, may produce variants of genes in human body.
A.Exposed |
B.Being exposed |
C.Having exposed |
D.After being exposed |