I was giving a talk to a large group of people, the same talk I ______ to half a dozen other groups.

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问题 I was giving a talk to a large group of people, the same talk I ______ to half a dozen other groups.

选项 A、was giving
B、am giving
C、had given
D、have given

答案C

解析 “我正在做报告”用的是过去时,而“我给另外6组人做报告”发生在这一事件前,故应用过去完成时。
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