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

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题型描述: 单选题
I was giving a talk to a large group of people, the same talk I _ _ _ _ _ _ _ to half a dozen other groups before.
A. am giving
B. was giving
C. have given
D. had given

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