对It must have rained .进行反问应用didn’t it还是hasn’t it?

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• must have done是过去完成式吗这种表达是过去完成式还是别的什么我很不理解下面这段话“当must用来表示对过去的情况进行“推测”（must + have done）时，如强调对过去情况的推测（一般句中有过去的时间状语），反意疑问句部分要用“didn’t + 主语”；如果强调动作的完成（一般没有过去时间状语），反意疑问句部分要用“haven’t / hasn’t + 主语”。”既然是过去完成式或现在完成式，为什么要用“didn’t + 主语”呢
• 关于must的反义疑问句It must have rained last night ,didn't it ? 这一题为什么要用didn't it? must的反义疑问句,在什么情况下不用must反问?拜托各位高手说详细一点.
• 42. —The ground is wet .—It must have just rained , _____________ ?A . hasn’t it B . didn’t it C . mustn’t it D . isn’t it
• The ground is wet ,so it must have rained last night,（ A hasn‘t it B didn’t it C mustn‘t it D doesn’t it
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• 反意疑问句中的musteg：It must have rained last night ,didn^t it He must have finished the work ,hasn^t he?为什么一个是didn^t 一个是hasn^t?两句话must后都是完成时啊,或者说是didn^t和hasn^t 都可用?
• 对It must have rained .进行反问应用didn’t it还是hasn’t it?
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• 对It must have rained .进行反问应用didn’t it还是hasn’t it?
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