I'm interested in ( ) you have saidA all thatB all whatC that D which选哪个,理由是,其他答案为什么错是选A的，为什么？

I'm interested in ( ) you have saidA all thatB all whatC that D which选哪个,理由是,其他答案为什么错是选A的，为什么？
I'm interested in ( ) you have said
A all that
B all what
C that
D which
选哪个,理由是,其他答案为什么错
是选A的，为什么？

I'm interested in ( ) you have saidA all thatB all whatC that D which选哪个,理由是,其他答案为什么错是选A的，为什么？
A.all作in的宾语,后面that引导定语从句修饰all.
我对你全部都感兴趣,什么全部,后面定语从句that you have said修饰all,你所说的全部
这个句子还可以这样表达,就是把B选项中的all去掉
I'm interested in what you have said.
what充当主句中in的宾语和从句中said的宾语,双重成分,只能由what引导.

A
all that=what=all the things that

B
这个是定语从句，that 代指what you have said all

B all what

all that=what；
what能既做先行词又做引导词，就是因为它可以拆成sth.(随你句子的需要，但是最常用的是all)+that,一个做先行词，一个做引导词
不知你明白了吗？:)
---gelumi~XD 助人最快乐

B
be interested in 后面要加名词或名词性从句,只能由what引导