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英语
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the road was muddy.it (must have rained) last night
为什么 ()里不填must rained 而要+have 呢 为啥不是must be rained
人气:143 ℃ 时间:2019-12-25 20:10:54
解答
这是对过去事实肯定推断的固定用法.加have 从另一个方面也表示这件事已经发生过了.
如果是对现在事实的推断,则可以不用加have.
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