2. 外语
  3. The children ______ happily in the classroom when the teacher came in.

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

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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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成人本科学位英语

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