13. This is one of the best books ______ ever been written on the subject.
问题描述：
13. This is one of the best books ______ ever been written on the subject.
A) which has B) which have C) that has D) that have
答
D
前面先行词为books,是指物,可用which或that,但是因为有best 修饰,所以只能用that
出现one of +复数 这样的结构,如果one的前面没有其他的修饰限定词,则先行词确定为of后面的复数名词