I have no idear at all __he wrote the letter--it isn't dated.为什么填when 而

问题描述:

I have no idear at all __he wrote the letter--it isn't dated.为什么填when 而
I have no idear at all __he wrote the letter--it isn't dated.为什么填when 而不填why?

下文有“it isn't dated” “没有标明日期”,可见指的是时间.指不知道他是什么时候写的这封信