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    –Let’s go singing tonight? --Sorry, I . I have to look after my sister. A. mustn’t B. may not C. can’t D. needn’t 【查看更多】

     

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    —Let's go singing tonight?
    —Sorry, I _____. I have to look after my sister.
    [     ]

    A. mustn't
    B. may not
    C. can't
    D. needn't

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