We were cleaning the room when someone knocked at the door.这句话的意思是什么?
问题描述：
We were cleaning the room when someone knocked at the door.这句话的意思是什么?
答
当有人在敲门的时候,我们正在打扫房间.knocked at the door是敲门的意思 cleaning the room 是打扫房间的意思 We were cleaning the room 这个是过去进行时