—When did you e back?
—Half an hour ago. You to music.
A. have been listening
B. were listening
C. had listened
D. listened
网友回答
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。