问题描述:
if…not与unless在这里都能用吗?
I'll be surprised if he doesn't have an accident.
I'll be surprised unless he have an accident.
这两句对吗?为什么?
I'll be surprised if he doesn't have an accident.
I'll be surprised unless he have an accident.
这两句对吗?为什么?
问题解答:
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