这里的which为什么改成what？非常疑惑

Question

单句改错：When i got to America, i found my english was different from which i had learned in China.
答案说改which为what, 但是越想我越迷糊。
在后面的这一小句里，which作from的宾语吗？
这句话完整写应该是：i found my english was different from the one which i had learned in China 对吗？那么后面从the one开始不是应该是定语从句吗？我好迷糊，请大神详细指教

Answer 1

您好，因为这句话different from 后面借的是介词宾语，如果用which的话，which是定语从句的关系代词，那么如你所举的例子，the one which是正确的，因为例子中有the one 作which的先行词，而原句中没有the one 则如果用which就缺乏先行词，而改成what之后，from 后面的 what...直到句末，整体名词性从句做宾语，不知道我说清楚没有，可追问

Answer 2

which 是关系代词，用来引导定语从句；what 是关系代词型连词，相当于 “先行词＋which”，用来引导宾语从句。本句的 different from 后面应该接宾语从句，即 what I had learned in China，等于 the English which I had learned in China。

Answer 3

which 是引导定语从句，需要有先行词，也就是你第二个句子的 the one. 

When i got to America, i found my english was different from the language which i had learned in China.

what 是引导名词性从句的，这里what =the language which, 所以答案才说你那句话要用what

Answer 4

大多数情况下，定语从句中的 the one which = 宾语从句中的what

which 是形容词属性，不能指代名词，因此可以有the one which作定语从句
what 是代词，可以指代名词，可以直接用，
what 比较简洁

Answer 5

说what就是最好的，多方便啊，熟练下就好了，语言别纠结本回答被网友采纳