The children ______ happily in the classroom when the teacher came in.A、talkB、a

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问题 The children ______ happily in the classroom when the teacher came in.

选项 A、talk
B、are talking
C、were talking
D、had talked

答案 C

解析考查时态。sb．was／were doing sth．when…表示“某人正在做某事时，这时……”句意：老师进来时，孩子们正在教室里愉快地交谈。故选B。

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