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
出自：国开英语2
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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
出自：国开英语2