为什么有时候must have done的反意疑问句有时不同？如：It must have rained last night和It must have rained
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must have done的反意疑问句：如果句中出现明确的时间状语， 如last night ，yeaterday， 等用didn't you。 反之， 用haven't you。It must have rained last night， didn't you？It must have rained ，haven't you？