18、I was giving a talk to a targe group of people,the same talk I __________to half a dozen other groups.

A.was giving        B.am giving     C.had given         D.have given

18、C

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I was giving a talk to a targe group of people,the same talk I __________to half a dozen other groups.

A.was giving        B.am giving     C.had given         D.have given

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