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

解析本题考查谓语动词时态。在when引导的时间状语中，谓语使用了一般过去时，强调的是事情的状态；主句由于强调的是从句动作发生时，教室里正在进行的动作，所以用过去进行时态即可。故选C。

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