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It is already 10 o'clock.Iwonder how it _____that she was tw

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It is already 10 o'clock.Iwonder how it _____that she was two hours late on such a short trip.
答案是came about 即”发生”,但是我认为came up也可以,它们都有发生的意思,有什么区别呢?
1.come about 发生,产生,出现
无被动语态.
记住这一点:
常用句型:How did it come about that从句?“.事是怎么发生的?”
2.come up v.
1)走近,上来,发芽,流行,发生,被提出
2)上升,讨论,出现
如:Please come up to me!
The problem came up at the meeting yesterday.