I was giving a talk to a large group of people, the same talk I __________ to half a dozen other groups before.<br>A. was giving<br>B. am giving<br>C. had given

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题目内容（国开英语2）

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

参考答案

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