You ()smoke when you see the sign.(needn't,mustn't)

问题描述:

You ()smoke when you see the sign.(needn't,mustn't)

填 mustn't,不能...表示禁止

You mustn't smoke when you see the sign.
当你看到那个标志的时候,你不能抽烟.


若有疑问及时追问,满意敬请采纳,O(∩_∩)O谢谢~~