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    The problem requires . A. studying with great care B. to study carefully C. to be studied without carelessness D. taking great care of studying it 【查看更多】

     

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    The problem requires ______.

         A. studying with great care                   B. to study carefully

         C. to be studied without carelessness           D. taking great care of studying it

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     The problem requires ______.

    A．studying with great care

    B．to study carefully

    C．to be studied without carelessness

    D．taking great care of studying it

     

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