While I TV in the sitting room the bell .A. watches ringsB. watched rangC. was watchin

问题补充：

While I TV in the sitting room, the bell .

A. watches, rings

B. watched, rang

C. was watching, rang

D. watched, was ringing

答案：

A. watches, rings

B. watched, rang

(答案→)C. was watching, rang

D. watched, was ringing

解析：while引导的时间状语从句，一般情况要用进行时态。