I was giving a talk to a large group of people, the same tal - 课程总测试 - 大学英语拓展课程 - 安徽省网络课程学习中心平台

I was giving a talk to a large group of people, the same talk I ______ to half a dozen other groups.
A was giving
B had given
C have given

I was giving a talk to a large group of people, the same tal - 课程总测试 - 大学英语拓展课程 - 安徽省网络课程学习中心平台 | 大学网课搜题引擎