after since when 用法

题目

after since when 用法
it's three years ___i saw him last time.
应选哪个?为什么?谢大侠了!
如果用SINCE是不是主句应该用完成时态呢？
如IT HAS BEEN THREE YEARS SINCE I SAW HIM LAST TIME。
再谢过各位大侠！
It seemed only severval minutes___ he finished this painting.
a.after b.before c.when d.until
如大侠 cglzhxy所说，这一题是不是该选A呢？

答案

这里应该用 since 翻译:我已经三年没有见过他了eg:It's been years since I enjoyed myself so much as last night.我已有好多年没有像昨晚那么痛快了.It has been +一段时间+ since sth.happened.是一个很有用的句...