Question

i can never forget the day

I can never forget the day when we worked togetherand the day we spent together.
为什么要填which

Answer 1

the day which we spent together
这里用which作spent的宾语,
when 只能作时间状语,不能做宾语.
通过这道题,希望你明白：不是先行词表示时间就一定用when,引导词还同时得在定语从句中作时间状语才可以.就像前半句一样,the day 既表示时间,when又在句中作时间状语.别忘了,work 是不及物动词,不能带宾语,所以,引导词只能作状语了.
希望能够帮到你,望点击采纳.