Is this book____you want to read?That's right.I like books a

Is this book____you want to read?That's right.I like books about the planets and the sun.
【答案】B
首先,the one作为不定代词在主句中充当表语,同时又作定语从句的先词.该句还原成陈述语序后为This book is _____ you want to read.(the one)
Is this the book____you want to read?Right.Can you lend it to me
A:/ B:the one C:the one that
【答案】A
该句中先行词是book,关系代词代替book在从句中作宾语,故可省略.该句还原成陈述语序为：This is the book ____ you want to read.

C the one作is表语，也是先行词，接了一个省略引导词的定语从句you want to read
A the book作is表语，也是先行词，接了一个省略引导词的定语从句you want to read