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    Mike said he was thinking about the maths problem at that time. A. which to do B. what to do C. how to do D. why to do 【查看更多】

     

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    Mike said he was thinking about _____ the maths problem at that time.
    [     ]
    A. which to do                
    B. what to do    
    C. how to do                  
    D. why to do

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