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had done是什么时态怎么翻译

  用法:

  1、表示某一动作在过去某一时刻之前已完成。例如:

  He had gone to bed by 10:00 last night.

  昨夜十点钟之前他已上床去睡了。

  2、与一般过去时搭配,表达某一动作在过去的动作发生时已完成。例如:

  The train had started when I got to the station.

  当我到达车站时火车已开走了。

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