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    A: How long did it you to work out the difficult Maths problem? B: I about half an hour on it. A.take, took B. spend, took C. spend, cost D.take, spent 【查看更多】

     

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    －How long did it ________ you to work out the difficult maths problem?

    －I ________ about half an hour on it．

    [　　]

    A．take; took

    B．spent; took

    C．spent; cost

    D．take; spent

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