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had done和had been down的区别
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had done是过去完成时态的主动语态.比如：I had finished my homework by last sunday.我上个礼拜天之前就已经完成了家庭作业.had been done 是过去完成时的被动语态.比如：My homework had been done by last sunday.我的作业在上个礼拜天之前就做完了.
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