问题补充：
The twins didn’t go to the theatre, they the light music all night.
A. have enjoyed
B. will enjoy
C. are enjoying
D. were enjoying
答案：
A. have enjoyed
B. will enjoy
C. are enjoying
(答案→)D. were enjoying
解析：句意：这对双胞胎没有去电影院，他们整晚都在家听轻音乐。结合语境可知下文描述的是过去某时正在进行的动作，故用过去进行时态。选D。
