who is knocking on the door ___must be Helen.
who is knocking on the door ___must be Helen.
someone is knocking at the door.___must be Tom.为什么用he而不用it?
Someone is knocking at the door,but who can____ be?
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?
---someone is knocking at the door.Who _____ it be?
who is knocking at the door?
1.----Who is knocking at the door
Listen!Who is knocking at the door?
Someone is knocking at the door.Who it be?— It be Tom.He is
who is knocking at the door?i suppose------must be bob.A.the