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问题: 英语题目!

It__john and kate who helped me the other day.
答案分别是:was , is , are ,were
正确答案给的是was,为什么啊?怎么不用were啊?请回答,谢谢!

解答:

这是个强调句型: It is(was)+被强调部分+that(who)+。。。被强调部分不管是什么都当作一个整体,所以谓语用is或者was.
例如:It was before class that they handed in their exercise books.就是在上课前他们交上了练习本。
It is the teachers who give me a lot of help. 正是这些老师给了我许多帮助。