题目

---Do you know Mrs. Yang ? ---Yes. When I worked in that international company, I      with her twice. A．had talked              B．talked             C．have talked            D．was talking 答案：B摩托车上的热机工作时提供动力的冲程是（ ）A.吸气冲程 B.压缩冲程 C.做功冲程 D.排气冲程