题目内容：

This is one of the best books ___. A. that have ever been written B. that has ever been writt选A

优质解答

这题关键看的是先行词是什么,如这种one of the +最高级+名词复数后面从句的谓语动词与名词复数保持一致,即用复数形式,如果是the only one of the +最高级+名词复数,后面的从句谓语动词与the only one保持一致,即用单数形式,在这里很明显就是复数形式了~!