Question

We ________ TV when the telephone ________．

1. A.
   watched; was ringing
2. B.
   were watching; rang
3. C.
   watch; rings
4. D.
   are watching; rang

Answer 1

B
解析：
选B。when引导的时间状语从句，表示当一个动作发生了的时候，另一个动作正在发生。