---Have you read the book?---Yes. But that one is worth reading. I suggest you it if you h

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A. best; read
B. well; read
(答案→)C. better; read
D. more; should read
解析：考察比较级用法和虚拟语气。固定搭配be well worth doing值得做某事；根据句义是只that book更值得阅读，故使用比较级better.第二空动词suggest表示建议的时候，后面的句子使用should+动词原形的虚拟语气。Should可以省略。故C正确。