—Oh,there's someone knocking at the door.—______ must be tha

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—Oh,there's someone knocking at the door.—______ must be that naughty boy.
其中,为什么用It?不用He?

因为不知道是谁.所以不能用he,or she.it 可以表示人物.
英汉词典的解释：
it：〔指心中记着或成为问题的人物、事情和行为〕.Go and see who it is.去看看是谁?It's me.〔口语〕是我 (＝It is I.).Oh,it's you!哦,是你呀!It's the girls having their rehearsal.是女同学在排戏.

—Oh,there's someone knocking at the door.—______ must be tha 单选oh,there's someone knocking at the door-must be your neigh 1.— There’s someone knocking at the door.Who could _____ be? there's someone knocking at the door.等于什么 Someone is knocking at the door.Who it be?— It be Tom.He is listen!someone is knocking at the door.------ must be my cou Someone is knocking at the door.___ it be Venis?—No,it ___ b There is someone knocking at the door.It may ________ (be) t 6.There is someone knocking at the door,who _____ it be? 一道英语填词题There is someone knocking at the door.Please go and s Someone is knocking at the door,but who can____ be? Someone is knocking at the door._must be Tom