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    [2013北京]22. Don’t turn off the computer before closing all programs you could have problems A. or B. and C. but D. so 【查看更多】

     

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    Don’t turn off the computer before closing all programs，________ you could have problems.????????????? ????????????? ????????????? ????????????? ????????????? ????????????? ????????????? ????????????? ????????????? ????????????? (2013·北京，22)

    A．or? B．and

    C．but? D．so

     

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