had happened to信息详情
发生在
had happened───已经发生过（happen的过去完成时）
happened to───碰巧
had to───不得不，必须（haveto和hasto的过去式）
happened to sb───某事发生在某人身上；碰巧发生在某人身上
happened───vi.发生（happen的过去式及过去分词）
happened to do───偶然，碰巧
happened to be───碰巧是；恰巧是
we had to───我们不得不这么做
happened to do sth───碰巧做某事
I neither knew nor cared what had happened to him.───我既不知道也不关心他出了什么事。
Tenyson became very upset about what had happened to the couple.───森对这对夫妇的遭遇感到非常沮丧。
She fell to brooding about what had happened to her.───她开始愤愤地思忖着自己的遭遇。
Pinocchio then told his father all the things that had happened to him in these two years.───皮诺奇把这两年所发生的事情全都讲给爸爸听。
"What if it had happened to Mrs. van der Luyden? " people asked each other with a shudder.───“这事若发生在范德卢顿太太身上，又会怎样呢？”人们不寒而栗地相互问道。
They did not like to talk about what had happened to their loved ones, and it was only with great difficulty that I dug stories out of them.───人们一般不愿意勾起亲人被害的伤心事。我要费很大的劲儿才从他们那里打听到一些情况。
When he heard what had happened to the axe, he jumped into the river and came out with a silver axe in his hand.───听说是斧子掉下水了，他就跳进河里，拿着把银斧子走出来。
Those things, which had happened to me before I met you, caused joys or sorrows, partings or reunions to me that tasted like green olive.───因为在你之前我还有一段属于我的历史，属于我的悲欢离合，属于我的青涩的橄榄和散落的珍珠。
33Then the woman, knowing what had happened to her, came and fell at his feet and, trembling with fear, told him the whole truth.───那女人知道在自己身上所成的事，就恐惧战兢，来俯伏在耶稣跟前，将实情全告诉他。
She fell to brooding about what had happened to her.
Her silence on/about what had happened to her surprised everyone.
I wondered uneasily if anything had happened to the children.
When I told them what had happened to me, they all chortled with mirth.
Compared to all that it had happened to him recently, this latest crisis seemed fairly small beer.
He was simply furious about what had happened to his mother.
She was impatient to know what had happened to her son.
I knew intuitively that something dreadful had happened to him.
I neither knew nor cared what had happened to him.