---Listen! Someone is knocking at the door. Who _____it be?

--Listen! Someone is knocking at the door. Who _____it be? ---Listen! Someone is knocking at the door. Who _____it be? --Listen! Someone is knocking at the door. Someone is knocking at the door,but who can____ be? someone is knocking at the door.who [ ]it be? ---someone is knocking at the door.Who _____ it be? Listen!Who is knocking at the door? listen!someone is knocking at the door.------ must be my cou Someone is knocking at the door.Who it be?— It be Tom.He is Someone is knocking at the door,but who can （ ）be.A one B he Someone is knocking at the door.Who can it be?的回答.A.Nothing 6.There is someone knocking at the door,who _____ it be?