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．/
此题选A，请问如果有what，是否可以选what

Answer 1

Is this book ________ you bought from the bookstore last
可以还原成：
This book is the one you bought from the bookstore last.
也可以写成：
This book is what you bought from the bookstore last.
所以你说的那种情况也是成立的！

Answer 2

可以

Answer 3

可以！

不管是"the one"，还是"what"，在这个句子里，差别非常微小。