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:上文的语境是过去时间,下文表示过去时间内正在进行的动作。