This is an useful book.You'd better read it carefully.修改病句

This is an useful book.You'd better read it carefully.修改病句 This is an useful book .You had better read it carefully 此句有 This is an useful book .You must read it carefully .哪里错了? The book is ( ) You would better read it carefully. A very w You an read this book. this is such an interesting book that you should read it This book is( )for your study,You'd better buy it 用help的正确形式 It is _____ reading this book carefully. this book is very____do you want to read it This is ______ useful book. A. a B. an C. the D/ It is ( ) useful book. It is useful book