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    11、---I have worked hard at English, but it seems that I haven’t made any progress.

    ---Keep on _____ at it, and you will be successful.

    A．work            B．working             C．to work           D．works

    11、B

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    ---I have worked hard at English, but it seems that I haven’t made any progress.

    ---Keep on _____ at it, and you will be successful.

    A．work            B．working             C．to work           D．works

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