英语翻译A：他留级了.B：到底是什么原因造成的?A：但是他说以后可以跳级.

A:He has to repeat a year.
B:What's happened any way?
A:I don't know,but he said he can skip a grade in the future.
再问： 你好，我有一点不解 what is happened ？ 这句话是什么句子结构, 或者直接 what happened？
再答： What's happened ＝ what has happened