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
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![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](/uploads/image/z/1924975-55-5.jpg?t=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%E7%AD%94%E6%A1%88%E6%98%AF%E9%80%89c%2C%E4%B8%BA%E4%BB%80%E9%82%A3%E4%B9%88%E4%B8%8D%E7%94%A8%E7%94%A8had%E8%80%8C%E7%94%A8have)
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
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
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
因为主句时态就是一般现在时,谓语动词为has!