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    I found very difficult to learn maths well. A. what B. it C. that D. this 【查看更多】

     

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    I found _____ very difficult to learn  maths  well.

    A．what             B．it                C．that              D．this

     

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    I found _____ very difficult to learn maths well.　

    [     ]

    A. what
    B. it
    C. that
    D. this

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    I found ________ very difficult to learn maths well．

    [　　]

    A．what

    B．it

    C．that

    D．this

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