题目内容
--- Why! I ________ get you on the phone.
--- We ________ basketball on the playground when you phoned.
- A.didn't; must be playing
- B.couldn't; must be playing
- C.couldn't; must have played
- D.didn't; must have been playing
D
第一句表述过去的真实情况,故用一般过去时;第二句表示就过去某时正发生的动作进行肯定推测,故用must have been doing。
第一句表述过去的真实情况,故用一般过去时;第二句表示就过去某时正发生的动作进行肯定推测,故用must have been doing。
练习册系列答案
相关题目