What were you doing ______there was a knock at the door?A.wh
they were i______ by a knock at the door
there was a knock on the door.
There was a knock at the door.It was the second time someone
He was sleeping when there was a loud knock at the door.[对sl
A knock at the door __him .A,interrupted B was interrupted C
A knock at the door( )him.a .interrupted b.was interrupted c
The Greens ()(have)supper when there was a knock at the door
while he was reading the letter,he heard a knock at the door
There was a knock at the door.(改为同义句)_____ ______ ______ the
There was a loud knock at the door.(用时间状语从句合并成一个句子)
There was a knock at the door when we () () (have) supper
he was falling ____(sleep) when he geard a knock at the door