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It must have rained last night,______?变反义疑问句

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It must have rained last night,______?变反义疑问句
It must have rained last night,______?变反义疑问句
It must have rained last night,DIDN'T IT?
再问: 为什么不是mustn't 再退一步也是hasn't 为什么是didn't
再答: 请比较: he must have seen the film,hasn't he?(没有过去时间,也就是到现在为止用现在完成时) he must have seen the film last week, didn't he (有过去时间用一般过去时) 表示猜测时,情态动词在反意疑问句时就不用了