为什么from which=that ？应该等于where... 您“高二英语语法简单问题．谢谢大家．／” 的回答... 谢谢

关代前面有介系词, 关代不可用that, 而必须是which或whom
如:
This report is based on my travel diary, from which I took the quotes (that) you are going to see throughout the pages.

"my travel diary"(先行词)是为介系词 "from"之受词(动词惯用take something from)
所以说"from which I took the quotes"的受词是"my travel diary"
也就是--> I took the quotes from my travel diary.

"that"指的是"the quotes"因其为受格 故省略
而"throughout the pages" 指的是 this report 的 pages...."throughout"本意为彻头彻尾或是贯穿之意
所以"throughout the pages"可以看成是"throughout this report"

"from which" 的"which"是受格关代 因为介系词"from" 所以不可替换成"that"
而逗点是非限定用法 意思是他只有一本travel diary 而不是从很多他的travel diary之中挑出的其中一本

请写出例句,否则我难以理解你的问题.

下面已经给你答案了，我说的不对，我承认。

from which=that 谁教你的？