问题描述: what you had done added to our difficulties.帮忙分析这个句子为什么add后要加ed 1个回答 分类:英语 2014-11-14 问题解答: 我来补答 what you had done主语 added to 谓语 our difficulties宾语 add 作谓语动词 ,加ed 是过去式. 展开全文阅读