问题描述： I had done ,I have done ,I am done有何区别完成时,过去分词等全部都没学 1个回答 分类：英语 2014-09-21 问题解答： 我来补答 i had done 我在过去的某个时间之前已经做过某事i have done 我已经做过某事i am done 我做完了某事 展开全文阅读
