havedone和haddone区别

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推荐答案 2014-07-24

Have done是现在完成时，意思大概是一个动作以前开始做，现在还在持续着的。

Had done是过去完成时，大概意思是一个动作发生在另一个动作之前。

比如:I had left my home when my
mother got up.

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