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
科目：高中英語(yǔ) 來(lái)源： 題型：
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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