I will never forget the days I stayed in your country为什么选 on which 不选 that

问题描述:

I will never forget the days I stayed in your country
为什么选 on which 不选 that

因为后面的句子缺成分
that 不当成分

首先这是个定语从句,修饰days.stay是及物动词所以后面一定要跟东西,所以只能选on which.