问题补充：
—When did you come back?
—An hour ago. Youthe computer games.
A. have played
B. were playing
C. played
D. had played
答案：
A. have played
(答案→)B. were playing
C. played
D. had played
解析：考察时态。句意：你什么时候回来的？——一小时前。你正在玩电脑游戏的时候。可知下文描述的是在过去某个时间正在进行的动作，故用过去进行时态，选B.
