Listen:Someone ______(knock) at the door.

Listen:Someone ______(knock) at the door. Listen,someone______(knock)at door --Listen! Someone is knocking at the door. Listen!There's someone_____(knock)at the door. Did you hear someone knock at the door knock at the door have you heard someone knock at the door?为什么是knock,不是knoking Listen!I hear someone knocking at the door. --Listen! Someone is knocking at the door. Who _____it be? ---Listen! Someone is knocking at the door. Who _____it be? knock at the door造句 关于knock at the door.