问题描述：
---what -------?---he hit a car.luckily,he wasn't badly hurt.
a .did he happen b.has he happened
c.was happen d.happen to him
ab我懂,排除了,但为什么不选c?如果要选c,怎么改?一定要用完成时吗?
a .did he happen b.has he happened
c.was happen d.happen to him
ab我懂,排除了,但为什么不选c?如果要选c,怎么改?一定要用完成时吗?
问题解答：
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