Please ____(knock)at the door when you come in.

Please ____(knock)at the door when you come in. knock on;knock at;knock over;knock 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 knock at the door before entering please句中只有KNOCK AT 一个动词?enter为什么不是? knock on knock into knock at knock up please knock at the door before you enter the room（同义句转换）please knock at the door _________ __________the rooom At Halloween ,children knock on ____ (people) doors ____(ask) for candies.Will you please ____ my son when l'm out. A wear B put on C at D dress up Every day I go to school t____ with my sister. —____ do they celebrate Thanksgiving Day? —____ tu knock at的意思 knock at的意思 Please knock at the door before coming i____the meeting room.横线上填什么单词 knock into sb和knock at knock on与knock at的区别 knock at,knock onWhat's the differance? knock at the door before entering please这句话是时间状语从句吗?那句中只有KNOCK AT 一个动词?enter不是？ Please ____(work) hard at it. knock at the door造句 Listen,someone______(knock)at door Listen,l hear someone knocking at the door的同义句Listen,____ _____ a knock on the door