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17.The woman ______ be our English teacher.She has gone to Canada.(  )
A.can'tB.needn'tC.mustn't

分析 翻译:这位女人不可能是我们的英语老师,她已经去了加拿大.

解答 从句意推测,是对这位女人的推测,情态动词表示推测的不可能只能用can't,
故选:A.

点评 can't、needn't、mustn't,主要是语气上的不同. can't表示的是不能够;mustn't表示的是不应该;needn't表示不必(没必要).

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