This book is more expensive than that one(保持原意)That book is_____ _____ than this one.That book isn't _____ _____ _____ this book.

问题描述:

This book is more expensive than that one(保持原意)
That book is_____ _____ than this one.
That book isn't _____ _____ _____ this book.

less expensive
as expensive as