He has had a toothache.He must be at the__(dentist)at the moment

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• He has had a toothache.He must be at the__(dentist)at the moment
• He has had a toothache.He must be at the__(dentist)at the moment
• Jimmy has a toothache.Must he sees a dentist?为什麽see加S是错误的?
• He has a toothache的否定形式,就是改否定句