When the teacher came in the students about the new film .A. are talkingB. were talkingC

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。