问题描述: but i don't think you can smoke here.I didn't know this is a...为什么是didn't 1个回答 分类:英语 2014-11-05 问题解答: 我来补答 用did not因为回答者所要表述的是他之前不知道不能抽烟这一个事实.表述的是过去的状态所以使用did not,望采纳 展开全文阅读