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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.was B.were C.are D.had been
答案是A,说是指代整件事.能解释一下,再举个选B的例子么
It ( )Mike and Mary who helped the old man several days ago.
这是一个强调句结构,它的构成 是:
It is.+被强调部分+..that/who.+剩下部分
It was.+被强调部分+..that/who.+剩下部分
也就是说,在这个句子中,是IT作主语,无论什么时候,谓语动词只能用单数.不存在用WERE的情况了.又如:
It is you that make me happy.
It ( )Mike and Mary who helped the old man several days ago. IT WERE MIKE AND MAY WHO HELPED THE OLD MAN SEVERAL DAYS AGO It______Mike and Mary who helped the old man several days ag 【选择】50.it （ ）Mike and Mary who helped the old man seveal day It____Mike and Mong who helped the ole man several days ago. （ ）Mary and her classmates that helped the old man clean his It ____ Jack and Mary who helped me the other day. 谓语动词的单复数形式It ( ) Jane and Mary who helped me the other day.A How do you like the old things _(discover) several days ago? Bob who everyone hates helped the old man who lost his way.这 It_____jane and mary who helped me the other day.A.is B.was The children helped the old man do some cleaning and washing