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

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
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

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
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

选B
首先是定语从句用which
其次one of the most...后面应该是复数
所以是which have

对 B

C
定语从句用that book been written.因为which不能引主语，这里只能用that
所以从C D 里选
其次定语修饰的是one 后面应该是单数

我觉得应该是A
首先是定语从句用which
其次this 和 one of the most 是指其中的一本书,所以是单数.
所以是which has

准确的答案是D
pbty00说得很具体了

D)that have
因为先行词books被形容词最高级修饰，且是复数。

选D
关系代词引导的定语从句,一下情况用that不用which

(1) 如果先行词是all, much, anything, something, nothing, everything, little, none等不定代词，关系代词一般只用that，不用which。例如：
All the people that are present burst into ...

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选D
关系代词引导的定语从句,一下情况用that不用which

(1) 如果先行词是all, much, anything, something, nothing, everything, little, none等不定代词，关系代词一般只用that，不用which。例如：
All the people that are present burst into tears.
Is there anything that I can do for you?
(2) 如果先行词被the only, the very, the same, the last, the best等词修饰，关系代词常用that(指人时，可以用who),例如：
This is the very book that I want to find.
That is the best film that we have seen.
I was the only person in my office that/who was invited.
(3) 当先行词被all, every, no, some, any, little, much所修饰时；
You can take any seat that is free.
(4) 当先行词被序数词或形容词最高级所修饰时。
It is the first foreign book that I have ever seen.
This is the most beautiful flower that I have seen.
(5) 在there be句型中，常用that.
There is a man that lives in that village.
(6) 先行词有两个，一个指人，一个指物，关系代词应该用that。例如：
The boy and the dog that are in the picture are very lovely.

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b