— Why on earth didn’t you answer the door?
— I’m terribly sorry, but the telephone , too.
A. is ringing
B. was ringing
C. rang
D. was about to ring
网友回答
A. is ringing
(答案→)B. was ringing
C. rang
D. was about to ring
解析：句意：--你究竟为什么不开门？--我真的很抱歉，但是电话也在想。说明在第一个人敲门的同时，电话也再响，表示过去某一时间正在进行的动作，用过去进行时，故选B