---Whatwereyoudoingwhenshedroppedin?-----I     forawhil...

问题详情：

---What were you doing when she dropped in?

-----I      for a while and      some reading.

playing; was going to do       ed; did

played; was going to do        played; did    

【回答】

C

知识点：动词时态与语态

题型：选择题