This book is mine(对划线部分mine提问) ______ ________ this book.

问题描述:

This book is mine(对划线部分mine提问) ______ ________ this book.
我知道可以是whose book is this?但题目所给的空格该怎么填?

应该是:
Whose is this book?
这本书是谁的
whose book is this?= whose is this book?