问题补充:
When the teacher came in , the students about the new film .
A. are talking
B. were talking
C. talked
D. talking
答案:
A. are talking
(答案→)B. were talking
C. talked
D. talking
解析:句意:老师进来的时候,学生们正在谈论那部新电影。过去进行时表示过去某一时刻或某段时间正在发生的动作。结合语境,老师进来的那一刻,学生们正在谈论。故选B。