When the students came into the classroom, the teacher _______ on the blackboard.

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问题 When the students came into the classroom, the teacher _______ on the blackboard.

选项 A、was writing
B、is writing
C、wrote

答案A

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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