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<br>D:have given

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

出自：专升本

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