I first met Mary three years ago when we______in a middle school together.

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问题 I first met Mary three years ago when we______in a middle school together.

选项 A、have worked
B、had been working
C、were working
D、had worked

答案C

解析 本题考查有关动同时态的用法。主句是过去式,时间状语从句用过去进行时。
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