只有当提问人无法确定被提问对象的身份时候才这样用
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In American English, “it” and “he/she/I” usage can be confusing sometimes for people who are not filiar with that。
Two dialogues refer to the similar situation and they are correct。
It is not a dramatic difference between those two。
For example, when you call someone on the phone, you don’t say “Who are you?” instead you say “Who is this?” When you answer the phone, you say “this is Mary”, but you don’t say “I am Mary”。
Therefore, “it/that/this” can use it to describe “he/she/I”。
其实没有什么区别
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