Question

14.i'm interested in __a____you have said. a. all that b. all what c. that d. which

为什么D不行？

Answer 1

you have said 是一个定语从句，修饰它前面的一个先行词的，如果选了D，就缺少了一个先行词。

翻译：我对你说的都感兴趣。

希望帮到你~

Answer 2

你所说的话，应该是用what you have said，作为从句时，就只能用i'm interested in what you have said. 或者i'm interested in all that you have said.
which不能表示什么的意思。

明白了吗？

Answer 3

A.
all that = what
which you have said： 这样不和题意啊