Question

Is this book ________ you bought from the bookstore last

Is this book ________ you bought from the bookstore last
Sunday?
A．the one
B．which
C．that
D．/
C为什么不选

Answer 1

正确答案是 A. the one.
此题考查定语从句。请你把它改为陈述句，结果如下：
This book is the one (that) you bought from the bookstore last Sunday.
主句 This book is the one 是主系表结构，是主句，the one 是先行词，后面接定语从句，定语从句的引导词 that 在从句中作 bought 的宾语，that 可以省略。
请对比：This is the book (that) you bought from the bookstore last Sunday. 在这句中，the book 作表语。如果原题在 book 前面有定冠词 the ，则选 C. that，但这里并不是 the book, 所以不能选 C，而一定要选 A。
希望对你有帮助。