Question

How did it come about是什么意思

Answer 1

How did it come about：这件事怎么会发生/怎么会这样？

这个句型往往后面加that构成从句，来陈述it：
例子：How did it come about that Amy knew Tom was lying？
Amy怎么会知道Tom在说谎？

也可以根据前后语境形成独立的一句话：
例子：He studied hard but failed the exam. How did it come about?
他学习很认真但考试不合格。怎么会这样呢？

Answer 2

1. 那事是怎样发生的
2. 那事是怎么发生的
例句:

1.
How did it come about?
这一切都是怎么发生的？

2.
How did such changes come about?
这种变化是怎么来的？

Answer 3

How did it come about
那事是怎么发生的
例句:

1.
How did it come about?
这一切都是怎么发生的？