The telephone but by the time I got indoors it stopped.A. had rungB. was ringingC. rin

问题补充：

The telephone , but by the time I got indoors, it stopped.

A. had rung

B. was ringing

C. rings

D. has rung

答案：

A. had rung

(答案→)B. was ringing

C. rings

D. has rung

解析：考查时态：句意：电话一直在响，但是到我到门里面了，电话就停了。从句子后部分by the time I got indoors可知电话响是发生在我进屋那一时刻，故用过去进行时。选B。