The first use of atomic weapons was in 1945,and their power___inreased enormously ever since.A.is B.was C.has been D.had been我选了C 是因为前后两句时态并列都是过去吗?
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The first use of atomic weapons was in 1945,and their power___inreased enormously ever since.
A.is B.was C.has been D.had been
我选了C
是因为前后两句时态并列都是过去吗?
ever since:表从那时到现在,或自从的意思,其通常与完成时态连用,因为主句表达的是过去的内容,所以这里要用过去完成时,自从那时起,那时指的是The first use of atomic weapons was in 1945.
ever since自从那以来 与完成时态搭配
到底是过去完成时 还是现在完成时
取决于前面有过去时间作为衬托 所以用过去完成时,表示“过去的过去”
我选C
如果选D,就成了1945年以前完成了,但实际上是从1945年到现在威力提升了,所以用现在完成时。
你的选择对的,ever since是完成时的标志
七宝答案各种错
YES
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