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

科目名称：人文英语4

试卷号：10862，11390

题型：词汇与结构(单选题)

题目：I was giving a talk to a large group of people, the same talk I () to half a dozen other groups before.

选项：A. was giving B. am giving C. had given

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答案：C. had given