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I wAs giving A tAlk to A lArgE group oF pEoplE,...

C 根据语境可知had given的动作发生在was giving之前

B

C 此题提供的语境是:我当时正在给一群人作报告,这个报告我曾给其他若干批人讲过。由于was giving为过去进行时,而“曾给其他若干批人讲过”显然发生在was giving这一过去时间之前,故用过去完成时,即答案选C。

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