—When did you come back? —Half an hour ago. You to music.A. have been listeningB. were li

问题补充：

—When did you come back?

—Half an hour ago. You to music.

A. have been listening

B. were listening

C. had listened

D. listened

答案：

A. have been listening

(答案→)B. were listening

C. had listened

D. listened

解析：考查时态。句意：—你什么时候回来的。—半小时之前，那时你们正在听音乐。根据句意是指在半小时前回来的时候，正在发生的事情，故使用过去进行时的时态。故B正确。