There is someone outside the door . Go and see who______is.

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There is someone outside the door . Go and see who______is. A this B that C it D he
Please tell me why ~
重点是,为什么A不可以

选 C,原因：it用于指人主要用确定未知人的身份：
“Who is it?” “It’s me.” “是谁啊?”“是我.”
“Listen.Someone is crying.” “Oh,it must be Mary.” “听,有人在哭.”“噢,一定是玛丽.”
Someone must have been here.But we have no idea who it was.一定有人来过,但我们不知道是谁.
为什么不能选A 原因很简单this is这个是（特指） ,正常的用法：通常是用于回答别人或者告诉别人一件事的时候 This是放在前面.
This is my pencil.
This pencil is mine.

There is someone outside the door . Go and see who______is. this是特指There is someone outside the door .Go and see who____ 英语 .There's someone at the door.Can you go and see who _____ someone is knocking at the door （）i go and see who it is A s someone is knocking at the door .（）i go and see who it is A —Someone is knocking at the door. —Yes, I’ll go and see who 一道英语填词题There is someone knocking at the door.Please go and s There is somebody at the door .I go and see who it is . there is ( ）knocking at the door.GO and see who it is A nobo Someone is ringing the doorbell .Go and see .A.w There is somebody knocking at the door .Go to see( ) it is. There is a dog ____(lie) outside the door