为什么是is knocking:Who is knocking(knock) at the door?it's me.
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?
---someone is knocking at the door.Who _____ it be?
"Who's knocking at the door?" "______ is Kate."
who is knocking at the door?it is ()me还是i呢?求理由
who is knocking at the door?it'me 还是I am 还是 it's I要详细一点 说明它们
someone is knocking at the door ()i go and see who it is A s
-Who's knocking at the door?- ____ me Tom.
--Who's knocking at the door?
单句改错 who is the men knocking at the door