always knock on the door before you enter

always knock on the door before you enter knock on;knock at;knock over;knock 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? 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 Would you please ____________(not knock)on the door? you must ____(knock)on the door before you enter knock on的音标 Knock on wood. 翻译 KNOCK ON knock on与knock at的区别