I still remember the days ____ i stayed with grandpa in the countryside when I was a small child.

问题描述:

I still remember the days ____ i stayed with grandpa in the countryside when I was a small child.
为什么这里只能用when而不可以用on which
i stayed with grandpa in the countryside when I was a small child on the days 可以马?
在我是小孩子的那些天里,我和祖母生活在乡下 按中文来说是完全么问题的..不知道英文来说是咋样..

用when,指在那些日子里.如果用on which的话,先行词应为单数. 指在那一天里.