knock at the door和knock on the door到底有什么区别?

knock at the door造句 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? Listen:Someone ______(knock) at the door. 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? 关于knock at the door.为什么不是knock the door? at表示什么? knock at a door和knock on a door的区别是什么 they were i______ by a knock at the door Listen!There's someone_____(knock)at the door. Listen!There's someone_____(knock)at the door. Please ____(knock)at the door when you come in. Listen,someone______(knock)at door 敲门和敲桌子用英语怎么说?那可不可以说成knock at the door呢？什么时候用at？ i think someone is in .let's knock the door 这句话的knock为什么要改成knock at You should knock at the door before you you _____ the room.【是go into 和 enter都行吗?还是?】 There was a knock at the door.(改为同义句)_____ ______ ______ the door. Listen!I hear someone knocking at the door.Listen!_____ ______ a knock on the door. knock at the door before entering please句中只有KNOCK AT 一个动词?enter为什么不是?