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题目内容
（国家开放大学人文英语4）
I was giving a talk to a large group of people，the same talk I ___to half a dozen other groups before.
单选题 (10 分) 10分
A.
was giving
B.
am giving
C.
had given
单选题 (10 分) 10分
A.
was giving
B.
am giving
C.
had given
参考答案