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反意疑问句到底后面跟的那个怎么用啊？在must和have 都有的时候到底是怎么提问啊？
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Teacherhei：1. must作“必须”解释， mustn't作“不允许”解释时 They must clean the floor, mustn't they/needn't they? 他们必须擦地板，是不是？ We must stay at ...(2010-02-18 08:14)
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HilaryDuff：用have e.g.You must have gone to Lily's party last night,haven't you?(2010-02-17 21:30)
