Is this book ( ) you borrowed from library .

问题描述:

Is this book ( ) you borrowed from library .
A the one B that C whom D who
我选的是B ,但是答案是A.老师说因为句子缺少了先行词,但是book不是先行词吗?

把它还原成陈述句: this book is ( ) you borrowed from library
很显然this book是句子主语,the one作表语(省略that,you borrowed from library )定语从句修饰the one