The book on the big desk is ourteacher's.(改为对划线部分提问)

The book on the big desk is ourteacher's.(改为对划线部分提问)
The book on the big desk is ourteacher's.(改为对划线部分提问)

The book on the big desk is ourteacher's.(改为对划线部分提问)
The book （on the big desk） is our teacher's.(改为对划线部分提问)
Which book is your teacher's?
哪本书是你老师的?