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【题目】The students ________ their homework when the teacher came in.

A.doB.didC.are doingD.were doing

【答案】D

【解析】

句意:当老师进来时,学生们正在做作业。

本题考查时态。do一般现在时,did是一般过去时,are doing是现在进行时,were doing是过去进行时。when引导的时间状语从句用的是一般过去时,主句用过去进行时。故选D

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