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C。
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