问题
选择题
I was giving a talk to a large group of people, the same talk I _____ half a dozen other groups before.[ ]
A. was giving
B. had given
C. am giving
D. have given
答案
答案：B
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I was giving a talk to a large group of people, the same talk I _____ half a dozen other groups before.[ ]
A. was giving
B. had given
C. am giving
D. have given
答案：B