It is three years ( ) we saw each other last year.括号中应填since.有学生问为何不填after.
问题描述：
It is three years ( ) we saw each other last year.括号中应填since.有学生问为何不填after.
答
在after 引导的从句中,主句和从句必须保持时态一致,从句过去,主句也要用过去范畴的.it is明显不是过去时态.所以只能用since.