I've read all the books ________ were borrowed from the library.

[　　]

I’ve read all the books 　　　　 were borrowed from the library.

　 A．they　　　　　 B．which　　 C．/　　　　 D．that

从所给的四个选项中选择最佳答案

I've read all the books ________ were borrowed from the library．

[　　]

A．they　　　B．which　　　C．×　　　D．that