——at the door before you enter my room A knock B knocking Ck
——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 should knock at the door before you the room.为什么用enter而不
______ at the door before you enter my room,please.
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))
you must ____(knock)on the door before you enter
always knock on the door before you enter
some one is knocking at the door 同义句 —— ——a knock at the doo
You should knock at the door before you you _____ the room.【
改错.Knock before you enter into the room.
同义句转换Please knock at the door before you go into the room