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    ( ) --- Could we play football in your playground, Sir? --- No, you have the principal’s note. A. if B. unless C. because D. since 【查看更多】

     

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    —Could we play football in your playground, Sir?
    —No, ________ you have the principal's note.

    [     ]

    A. if
    B. unless
    C. because
    D. since

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