It______Mike and Mary who helped the old man several days ago.A.was B.are C.were D.had been这个貌似是考主谓一致了,但是这里为什么要用单数was?

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It______MikeandMarywhohelpedtheoldmanseveraldaysago.A.wasB.areC.wereD.hadbeen这个貌似是考主谓一致了,但是这里为什么要用单数

It______Mike and Mary who helped the old man several days ago.A.was B.are C.were D.had been这个貌似是考主谓一致了,但是这里为什么要用单数was?
It______Mike and Mary who helped the old man several days ago.
A.was B.are C.were D.had been
这个貌似是考主谓一致了,但是这里为什么要用单数was?

It______Mike and Mary who helped the old man several days ago.A.was B.are C.were D.had been这个貌似是考主谓一致了,但是这里为什么要用单数was?
选A,这是一个强调句,It是形式主语,可以理解成这件事的代称.单复数是紧跟着这件事而不是这两个人,所以是was.不要受B,C干扰