I was giving a talk to a group of people.I____ the same talk to other groups before.
人气：390 ℃ 时间：2020-03-21 23:27:11
解答
填:had given
was giving 是过去动作,在此之前曾给其他几群人作过同样的报告,
故应用过去完成时.
句意:我当时正在给一群人作报告,在此之前我曾给其他几群人作过同样的报告
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