Tom began to work as a postman after he left school three years ago.

题目

Tom began to work as a postman after he left school three years ago.
One morning,he stopped his bike outside a house and then rang the bell.A window opened and a woman appeared."W____ is it?" asked the woman.填什么?为什么?

答案

who.
“Who is it?" 意思是：是谁?
这里不能填what,有很多人要填成what,但是what不对.
英语口语里还有一个习惯,就是在”不知道对方是什么人的情况下“,口语中要用”it"来询问,而不用who are you,更不可用what is it.
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谢谢.