Who's that at the door?____ is the postman.A.She B.This C.It

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Who's that at the door?____ is the postman.A.She B.This C.It D.He
选c还是d呢?不知道性别的用it,但是这个句子应该是知道的,看到了是个男的,还有,如果这样为什么不说who's that man呢?

选C
一般在问不知道是谁的人的时候,都用IT指代.这个是固定的用法.回答的人可以是旁人也可以是postman本人,都用it's
比较特殊的情况还有打电话的时候,问方问的时候用that,答方回答用this.
还有就是刚出生的婴儿,用it.it's a girl/boy.
再问：嗯，这个知道，可是最近翻看小学课本上发现有这么一句：who's that man ? -- he's Mike. he's a new student，为什么不用it呢？
再答：这句问题中就提到了man，说明是看到了这个人了，所以回答直接用he，这段对话应该是两个人在指着某处的一个男人，相互之间在讨论。一般用it是还没看到此人，门外的人或有人敲门之类的，在你无法辨别性别，或者说只闻其声未见其人的时候用it，打电话也是这个道理。

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