They are the best booksI have read this year.A. whoB. thatC. theseD. those

问题补充：

They are the best booksI have read this year.

A. who

B. that

C. these

D. those

答案：

A. who

(答案→)B. that

C. these

D. those

解析：本句的含义为它们是我这年看过最好的书，修饰名词books为定语从句，先行词为事物，关系词可用that，故本题选B。