The playground is wet this morning.It must rain last night.isn't it?为什么

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The playground is wet this morning.It must rain last night.isn't it?为什么
The playground is wet this morning.It must rain last night.isn't it?为什么

The playground is wet this morning.It must rain last night.isn't it?为什么
It must rain last night.isn't it?这整个句子都是错的.用isn't it来反问,更是错的.
(The playground is wet this morning)早上操场还是湿的,由此推测昨晚肯定下雨了.
对过去情况肯定的推测,应用must have done sth.,其反意问句是用didn't 来反问.
因此It must rain last night.isn't it?应改为:
It must have rained last night,didn't it?
昨晚肯定下雨了,对吗?

什么为什么。