you should knock at the door before you the room.为什么用enter而不用enter into

When you ____ others,you should say sorry at once.A,knock toB,knock atC,kWhen you ____ others,you should say sorry at once.A、knock toB、knock atC、knock onD、knock into If you someone,you should say “I’m sorry”.A.knock at B.knock over C.knock into D.knock out的答案是什么 为什么 You should knock at the door before you you _____ the room.【是go into 和 enter都行吗?还是?】 you should knock at the door before you the room.为什么用enter而不用enter into knock on;knock at;knock over;knock knock on knock into knock at knock up if I were you I will knock at Please ____(knock)at the door when you come in. knock at的意思 knock at的意思 knock into sb和knock at knock on与knock at的区别 knock at,knock onWhat's the differance? you should always remember to knock the door when _____ the room.该填什么? knock you down 造句 You must knock at the door before you e_____the teachers’office. scientists are confident that they can make lasers which can ________missilesA knock downB knock outC knock intoD knock offYuo think you`re poor,but look at ter people in really poor countries---it`s all__.A relativeB simpleC similarD reatedHe__down please knock at the door before you enter the room（同义句转换）please knock at the door _________ __________the rooom