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问题: 英语题

I was giving a talk to a large group of people ,the same talk I ( )to half a dozen other groups.
A.was giving B.are giving C.had given
D.have given

解答:

I was giving a talk to a large group of people ,the same talk I (C )to half a dozen other groups.
A.was giving B.are giving C.had given
D.have given
was giving:谓语,为过去式,the same talk I had given to half a dozen other groups.对上一句talk的解释,发生在I was giving a talk to a large group of people前