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

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题目内容（河南大学大学英语）

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

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