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    - Have you finished the maths problem? - Not yet, because I find it difficult. A. in working out B. working out C. to work it out D. to work out 【查看更多】

     

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    - Have you finished the maths problem?
    - Not yet, because I find it difficult ______.
    [     ]
    A. in working out    
    B. working out    
    C. to work it out    
    D. to work out

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