Evidence has been put forward showing that astronauts expose

来源：学生作业帮编辑：作业帮分类：英语作业时间：2024/06/03 00:09:39

Evidence has been put forward showing that astronauts exposed to long periods of weightlessness _ quite severely.
A.have affected
B.had affected
C.have been affected
D.had been affected
答案是选c,为什那么不用用had而用have

.显然是have,它在描述一种事实,而不是完成的时态,你可能看到了exposed这个词,但是这不是过去式,你去查下字典就知道了,又不是加了ed就代表过去式

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