Children knock on n.doors and called "trick or treat"根据首字母n写单词!

Children knock on n.doors and called trick or treat根据首字母n写单词! knock on;knock at;knock over;knock knock on knock on knock into knock at knock up knock on的音标 Knock on wood. 翻译 KNOCK ON knock on与knock at的区别 Knock on 和Knock at 有什么区别啊? knock at和knock on有区别吗? knock at 和knock on 有什么区别? knock at 和knock on怎么用?RT knock knock knock knock knock knock