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题目内容
（哈尔滨电大直属学院-人文英语）
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.
was giving
B.
had given
C.
am giving
选择一项：
A.
was giving
B.
had given
C.
am giving
参考答案