had happened on信息详情
发生在
had happened───已经发生过（happen的过去完成时）
happened on───偶然遇到或发现
happened───vi.发生（happen的过去式及过去分词）
had been on───一直在
happened to───碰巧
had───aux.已经（用于过去完成时和过去完成进行时）；v.有；吃；得到（动词have的过去式和过去分词）
happened next───接下来发生的事
happened by───发生在
no happened───没有发生过
He had never gone into details about what had happened on the island on the lake: the events that had taken place after he and Dumbledore had returned to Hogwarts had eclipsed it so thoroughly.───他从来没有跟他们讲过在湖心小岛的具体细节。他和邓布利多回到霍格·沃茨后发生的事情，使那一幕显得毫不重要了。
However, plan always changes during processing. So, I am writing down some sentences just to explain what had happened on me last night.───可是计划永远赶不上变化，于是现在的我写下的东西只能解释那些昨晚发生在我身上的事情。
The spots would show an interesting play that had happened on the field.───这个节目会展示赛场上发生的有趣情况。
B Y THE LATE SUMMER the news of what had happened on Animal Farm had spread across half the county.───到夏末的时候，动物庄园里发生的一切已经传遍了半个郡。
Then the two told what had happened on the way, and how Jesus was recognized by them when he broke the bread.───两个人就把路上所遇见，和掰饼的时候怎么被他们认出来的事，都述说了一遍。
He talked about what had happened on the road.───他谈到了路上发生的事。
When I explained what had happened on the train he shook his head and said one should never trust the Moors.
She gave a faithful account of what had happened on that night.
The police showed him a photo to try to jog his memory about what had happened on the night of the robbery.
The incident had happened on the return journey.
Worse things had happened on the retreat from Dunkirk.
If Kelly's fall had happened on a racecourse, she would have been sidelined as a matter of course.