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单选题公共英语一级

2010-07-31

When the students came into the classroom, the teacher__________on the blackboard.

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参考答案

A

答案解析

本题考查动词时态。when引导的从句是一般过去时，主句中的动词若是延续性动词，那么该动词要用过去进行时态。

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