请高手帮看看这道高考题啊。。为什么选from where定语从句介词后不是不可以加副词吗。。急急急急急急

from 是一个特殊介词，后面可以跟介词短语，比如：from under the table; A cat ran out from behind the door. 一只猫从门后面跑出来。 这是一种特殊用法，不用按照我们学过的定语从句中“介词+which” =where 结构来理解，通常根据语义判断。考试中看选项，如果有from where这种结构，通常是对此特殊结构的考查，也往往是正确答案。例句 At that moment, I was just standing by the windowin my room, _______I could see what was occuring on the street. 此处from where 相当于 from through the window.

先把定语从句还原为原句是，I could see what was occuring on the street from the window，所以where表地点，定于从句为 where I could see what was occuring on the street from ，根据英语习惯from要从后面提到前面来变成，from where I could see what was occuring on the street。