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

A．a(chǎn)pplying to improve                      B．a(chǎn)pplied to improving

C．a(chǎn)pplied to improve                       D．a(chǎn)pply 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．a(chǎn)pplying to improve                      B．a(chǎn)pplied to improving

C．a(chǎn)pplied to improve                       D．a(chǎn)pply to improving

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