who is this 或Who is that的回答可以用she is 或he is吗还是必须用this is 或that is

问题描述:

who is this 或Who is that的回答可以用she is 或he is吗还是必须用this is 或that is

最好使用原来疑问句所提供的代词,即:
This is Tom.
That is Mary.