It（）Mike and Mary who helped the old man several days ago._精华吧

It（）Mike and Mary who helped the old man several days ago.

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It（）Mike and Mary who helped the old man several days ago.

A.had been

B.was

C.were

D.are

正确答案：was

Tag：科技英语语法时间：2024-01-08 09:43:12

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