从方框中选择句子补全对话。(只填序号)

A. He is from the USA. B. No, he isn't. C. Who's that woman? D. Who's this man? E. He's my grandpa.

Tom: Who's that man?

Ann:

Tom:

Ann: She's my grandma.

Tom: Is he your father?

Ann:  He's my teacher.

Tom: Where is he from?

Ann: