— Why weren't you at the meeting?　　— I for a long distance call from my sister in America

问题补充：

— Why weren you at the meeting?

— I for a long distance call from my sister in America.

A. was waited

B. was waiting

C. has waited

D. have been waiting

答案：

A. was waited

(答案→)B. was waiting

C. has waited

D. have been waiting

解析：上句说“你为什么没去参加会议”，据此回答“我当时正在等我妹妹从美国打来的长途电话”，说的是“你们开会时”我正在等一个电话，所以用过去进行时，故选B。