whose is this book?请问它的回答到底是：this book is mine.还是：this is my book.

Question

whose is this book?
请问它的回答到底是：this book is mine.
还是：this is my book.

Answer 1

Whose is this book?
This book is mine.比较好,避免重复.
This is my book.也可以,没有前面一种好.