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【题目】The teacher came into the classroom while the students _________ their homework.

A. are doing B. did C. were doing

【答案】C

【解析】

句意:当学生们正在做作业的时候,老师走进了教室。are doing正在做,现在进行时;did做,是do的过去式;were doing正在做,过去进行时。根据句中The teacher came into…可知,这句话用的是过去时态,且从句中表示的是正在进行的动作,因此应用过去进行时态,选C。

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