do you know the year ( )the chinese communist party was founded? a which b that c when d on which

题目

do you know the year ( )the chinese communist party was founded? a which b that c when d on which
为什么选c 不选 d 而且 关系代词和关系副词有什么区别啊 !极限的不太明白的!

答案

关系副词用来引导关系从句,即定语从句.
关系副词所引导的形容词子句用于修饰主要子句中的某一名词或代名词,被修饰的词称作先行词,关系副词要放在先行词之后.
关系代词是用来引导定语从句的.这类代词都起着三重作用,一是代表前面的名词,二是把从句和它所修饰的词连接起来,三是在从句中叶担任一个成分.
在这里是时间的问题,所以选when正确.