I will never forget those days ____I spent in the countryside together with my grandmother as a childA.when B.which C.on which D.in which为什么答案选B,为什么前面是days为什么不能用when?

问题描述:

I will never forget those days ____I spent in the countryside together with my grandmother as a child
A.when B.which C.on which D.in which
为什么答案选B,为什么前面是days为什么不能用when?