The ground is wet,it must have rained yesterday.
请问为什么The ground is wet,it must rain yesterday.不行
人气：134 ℃ 时间：2020-01-25 21:50:17
解答
这是因为：must have done 的意思是一种推测：
句子意思是：地面是潮湿的,一定（偏肯定的推测）是昨天下了雨!
如果你must ,是作一定下了,没有推测的意思!
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