问题描述: Look at the sign!It says No Smoking.You____smoke here填shouldn't还是mustn't 1个回答 分类:英语 2014-10-05 问题解答: 我来补答 mustn't 表示禁止,语气很强烈shouldn't 更多用于虚拟语气句等中,也是will的否定,意思为不应该 展开全文阅读