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    It Jack twenty minutes the math problem yesterday. A. took; to work out B. takes; worked out C. has taken; work out D. is taking; working out 【查看更多】

     

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    It _____ Jack twenty minutes _____ the math problem yesterday.    
    [     ]
    A. took, to work out
    B. takes, to work out
    C. has taken, working out
    D. is taking, working

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