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    Maths is not easy to learn, we must work harder. A. but B. or C. so D. and 【查看更多】

     

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    Maths is not easy to learn. _____ we must work harder.     
    [      ]
    A.  but    
    B.  or      
    C.  and      
    D.  so

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    Maths is not easy to learn ______  we must work harder.     
    [     ]
    A. but    
    B. or      
    C. and      
    D. so

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