--Was Mr Wang late for the meeting?----Yes,the meeting had begun when he got to the school.--Was Mr Wang late for the meeting?----Yes,the meeting had begun when he got to the school.为什么不用had been on
问题描述：
--Was Mr Wang late for the meeting?----Yes,the meeting had begun when he got to the school.
--Was Mr Wang late for the meeting?
----Yes,the meeting had begun when he got to the school.
为什么不用had been on
答
这里的was是虚拟语气助词而不是你所理解的“过去” ，表示不一定发生的事情 说不上来道理。我上学的时候遇到这种就背下来。。。
答
had begun 在这里是对的,只表示开始,不表示延续
had been on用于后面加for an hour 或诸如此类的表示一段时间的句子里,表示延续