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    11、The computer system crashed and I lost           of work.   

    A. three hour’s worth                                               B. three hours’ worth  

    C. three hours’ worthy                                             D. three hour’s worthy  

    11、B

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    The computer system crashed and I lost           of work.   

    A. three hour’s worth                                               B. three hours’ worth  

    C. three hours’ worthy                                             D. three hour’s worthy  

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