after since when 用法

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. 是一个很有用的句型。现在常写作：

It is +一段时间+since sth. happened

副词 adv. 什么时候，何时
at what time
· When can you come to see me?
你什么时候来看我？
· When did you go to bed last night?
昨晚你什么时候睡觉的？
· When are you going to return it?
你准备什么时候还（书）？

副词 adv. 是…时候
at which;on which
· Please tell me when we'll have the meeting.
请告诉我我们什么时候开会。
· I wonder when that was.
我不知道那是什么时候的事。

副词 adv. 在…的时候
at or during which
· How I regretted the days when I had played and should have studied!
我多么懊悔我本该好好学习却玩掉了的那么多的日子！

副词 adv. 那时
but at that moment
· It happened on a day in November when the weather was very wet and cold.
这事发生在十一月的一天，那时天气又潮湿又寒冷。
· We were about to start,when it began to rain.
我们刚要出发时开始下雨了。

连词 conj. 当…时
at the time when
· It happened when I was living in the country.
这事发生在我住在农村的时候。
· It was raining when we arrived.
我们到达时，天正下着雨。
· He always comes on those days when I am busy.
他总在我忙的日子来。
· I was walking along the stream,when I met my teacher of English.
当我沿着小溪散步时遇到了英语老师。

连词 conj. 一…就
immediately after
· When I had finished dinner I went to bed.
我吃完饭就睡觉了。
· She was very surprised when she saw me.
她见到我非常惊讶。
· Let us set out when the sun has risen.
太阳一出来，我们就动身。

代词 pron. （关系代词）那时
which time
· I came here in 1949, since when I have been engaged in this work.
我1949年到这里，从那时起我就担任这项工作。
· We came a week ago,since when the weather has been bad.
我们在一星期前来此，从那时起天气就一直不好。

代词 pron. （疑问代词）什么时候
what time
· Since when have you been here?
你从何时起在此地？
· Until when can you stay?
你能呆到什么时候？

一般说来，如果在过去某一时间内先后发生了两个动作，那么先发生的动作用过去完成时，后发生的动作用一般过去时。但是若用连词after 来连接这两个动作，由于after本身已说明了两个动作的先后关系，所以两者均可用一般过去时。

问题：It seemed only severval minutes___ he finished this painting.

a.after b. before c. when d. until

你的回答不对，应该是它表示好象没过几分钟他就完成了这幅绘画作品。
It +be +time before ------
你也要具体问题具体分析，不能生搬硬套，那样行不通！加油吧！来自：求助得到的回答

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