we spent together on island.是定语从句,spent 是及物动词,需要宾语the days,即spent the days together...,故the days 后面需要用关系代词which(代替the days)来作spent的宾语.
而during which则是时间状语,定语从句需要的是宾语,不是状语.
we spent together on island.是定语从句,spent 是及物动词,需要宾语the days,即spent the days together...,故the days 后面需要用关系代词which(代替the days)来作spent的宾语.
而during which则是时间状语,定语从句需要的是宾语,不是状语.