问题
单项选择题
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
答案
参考答案：C
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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
参考答案：C