题目

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. am giving     C. had given   D. have given 答案：C总部位于江苏徐州(约34°N,117°E)的某企业承接了甲国(如下图)价值7.446亿美元的工程机械定单。读图，甲国位于(　　)A. 欧洲 B. 非洲C. 北美洲 D. 南美洲