问题描述: you must have seen her yesterday 改为反义疑问句 1个回答 分类:英语 2014-09-20 问题解答: 我来补答 You must have seen her yesterday ,didn't you? 再问: 为什么? 再答: must have done表推测 如果句中有过去时间 反义疑问用过去时 如果没有过去时间 反义疑问用现在完成时 句中出现了yesterday 所以是didn't you 展开全文阅读