you must ____(knock)on the door before you enter
you must ____(knock)on the door before you enter
always knock on the door before you enter
Tom,____(knock)on the door before you come in next time
you should knock at the door before you the room.为什么用enter而不
please knock at the door before you enter the room(同义句转换)
Please knock at the door before you enter the room .(同义句转化))
——at the door before you enter my room A knock B knocking Ck
______ at the door before you enter my room, please. A.Knock
You must knock at the door before you e_____the teachers’off
Before you_____(enter)the office,you should______(knock)at t
改错.Knock before you enter into the room.
Please knock on the door before you go to the office 同义句