关于宾语从句的一道题

问题描述:

关于宾语从句的一道题
1、I will never forget those days_____we spent together in the country.
A.which B.when C.where D.who
2、I will never forget those days_____we worked together in the country.
A.that B.when C.there D.which
为什么这两个句子只有一个单词的差别,但是填的词却不一样呢?

we spent those days in the country 这里做从句里的宾语 所以用which
we worked together in the country in those days 这里是做从句里的状语 而前面没有介词 就用when