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    50．-Listen! Helen is singing in the hall. -It be Helen. She has gone to Beijing. A．can’t B．may C．mustn’t D．should 【查看更多】

     

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    — Listen! Helen is singing in the hall.
    — It _____ be Helen. She has gone to Beijing.
    [     ]
    A. can't
    B. may
    C. mustn't
    D. should

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