Before you_____(enter)the office,you should______(knock)at t
Before you_____(enter)the office,you should______(knock)at t
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)on the door before you enter
always knock on the door before you enter
改错.Knock before you enter into the room.
Please knock on the door before you go to the office 同义句
______ at the door before you enter my room,please.
Before you enter the teaher's office,you should k____ on the