问题描述: Ann returned the book to the library yesterday.改为一般疑问句后return要加s吗? 1个回答 分类:英语 2014-11-17 问题解答: 我来补答 Did Ann return the book to the library yesterday?不需要哦~因为does do did这类助动词后面都用原型哦~这里是过去所以用did 展开全文阅读