He was just __ __ when there was a loud __ __ the door.

问题描述:

He was just __ __ when there was a loud __ __ the door.
他刚要入睡,就有人大声敲门.
4空

fall asleep just副词 修饰动词用原型
knocking at loud形容词 修饰名词用动名词