I heard someone ____(knocking/knocked)at the door just now.

I heard someone ____(knocking/knocked)at the door just now. I heard someone _____(knock /knocking) at the door just now who was knocking at the door just now?还是who knocked at the d Someone knocked at your door just now,but I dindn't see who Someone is knocking at the door.____ is it? -----Someone is knocking at the door.It ____ be Tom . When I started ____ the big cake,someone knocked at the door What where you doing when someone Knocked at the door?I ____ I hear someone knocking at the door.的同义句 Listen!I hear someone knocking at the door. I () my brother when someone knocked at the door I ( ) go out when someone knocked at the door.