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关于 must have done.

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关于 must have done.
It must have rained last night.表示 对过去的肯定猜测
昨晚肯定下雨了.
那么要表示对过去的否定猜测怎么表达呢? 比如说昨晚肯定没下雨.
It can't have rained last night!
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