someone is knocking at the door,____ _____?如何变反义疑问句

someone is knocking at the door,____ _____?如何变反义疑问句 Someone is knocking at the door.____ is it? ---someone is knocking at the door.Who _____ it be? -----Someone is knocking at the door.It ____ be Tom . --Listen! Someone is knocking at the door. Open the door!Someone is knocking at it.It _____ Mr Zhang.He 6.There is someone knocking at the door,who _____ it be? 英语翻译sorry，是Someone is knocking _____ ______ the door. Someone is knocking at the door,but who can____ be? Someone is knocking at the door._must be Tom someone is knocking at the door.who [ ]it be? --Listen! Someone is knocking at the door. Who _____it be?