I was giving a talk to a large group of people，the same talk I ___to half a dozen other groups before. 选择一项： A. had given B. was giving C. am giving

I was giving a talk to a large group of people，the same talk I ___to half a dozen other groups before.
选择一项：
A. had given
B. was giving
C. am giving

出自：人文英语4

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