it ______last night,for the ground id wet.这里为什么要用must have rained
人气：393 ℃ 时间：2019-12-13 06:26:10
解答
must have done 意思是：必定是.,想必是.,一定做了
是对过去发生过的事比较肯定的猜测,这是情态动词的用法,情态动词+have done
意思是：昨天晚上肯定下过雨了,因为地是湿的.
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