问题描述：
27.the same talk I to half a dozen other groups before.
27. 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
选C的原因?
27. 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
选C的原因?
问题解答：
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