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    14、He devoted most of his time to his research，believing his hard work would      sooner or    later．

    A．put off          B．take off            C．come off         D．pay off

    14、D

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    He devoted most of his time to his research，believing his hard work would      sooner or    later．

    A．put off          B．take off            C．come off         D．pay off

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