【答案】This is the most interesting book ______ I have ever read.

This is the most interesting book ______ I have ever read.

A. what B. which C. that D. it

【答案】

C

【解析】

句意为：这是我曾经读过的最有趣的书。这是一个定语从句，从句的引导词根据先行词而定。当先行词由序数词或最高级修饰时，引导词应用that。结合选项可知应选C。