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    17、If the new invention had been _____ the working conditions of the coal miners，there wouldn’t have been such a serious accident．

    A．applying to improve                      B．applied to improving

    C．applied to improve                       D．apply to improving

    17、B

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    If the new invention had been _____ the working conditions of the coal miners，there wouldn’t have been such a serious accident．

    A．applying to improve                      B．applied to improving

    C．applied to improve                       D．apply to improving

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