Please knock on the door ( )you came into the room A after B before C until D while

Would you please ____________(not knock)on the door? Please knock on the door before you go to the office 同义句 Please knock on the door before _into the Office.进办公室前请敲门 翻译 knock on;knock at;knock over;knock Please knock on the door ( )you came into the room A after B before C until D while knock on the door 同义句 Who is_______(knock)on the door? Who is_______(knock)on the door? knock on knock off book on the floor还是knock over book on the floorrt是knock off the book 还是 knock the book off? 英语改错 “Please knock the door before entering.” Please ____(knock)at the door when you come in. knock at the door敲门应该是knock at the door,有时也看到有用knock on the door的,还有是不是可以直接说“knock the door呢? knock at the door 和 knock on the door有什么区别吗详解,谢 knock at the door和knock on the door到底有什么区别? knock on knock into knock at knock up can you hear someone _____(knock) on the door now you must ____(knock)on the door before you enter