摘要：(七)过去完成时 表示在过去某个时刻前已经发生的动作或状态.或者从过去某个时刻开始一直延续到过去另一时刻的动作或状态. 例如: 1) By the end of last year, we had learned more than 2,000 English words. 2) My teacher had taught in that school for ten years before she came here.

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