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    A.a hour B.half hour C.half a hour D.half an hour 【查看更多】

     

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    Half an hour's exercise a day ________ doctors away.

    A. keep

    B. keeps

    C. is keeping

    D. kept

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    It _____ half an hour to walk from the city library to the post office.
    [     ]
    A. takes          
    B. spends          
    C. pays          
    D. costs

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    It _______ half an hour to finish drawing this picture.
    [     ]
    A. spends
    B. talks
    C. costs
    D. takes

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    He _____ half an hour _____ English every day.
    [     ]
    A. spend; on
    B. spends; on
    C. take; in
    D. cost; on

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    It ______ half an hour on my homework yesterday. 　　 　

    [     ]

    A. took　　　
    B. spend 　　 　
    C. used 　　 　
    D. spent

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