this is the book _____which I wrote down many note .

问题描述:

this is the book _____which I wrote down many note .

on

this is the book ___in__which I wrote down many note .
在这里 in which=where ,都是定语从句的引导词
希望对你有帮助O(∩_∩)O~

on
write...on 在……上