This is the most interesting book I have ever read.A. whichB. thatC. /D. B and C

问题补充：

This is the most interesting book I have ever read.

A. which

B. that

C. /

D. B and C

答案：

A. which

(答案→)B. that

C. /

D. B and C

解析：句意：这是我度过的最有趣的书。Book后面接的是定语从句，用来修饰book；book是先行词，前面有最高级修饰，所以只能用that，选B。