the problem may lead to more serious ones if xxxx unsolved

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the problem may lead to more serious ones if xxxx unsolved
a,making b,remained c,keeping d,left 为什么这里选left 还有为什么and可以表并列,be to do可以表目的或者将来最好有例句分不多,请见谅

原句变形为 The problem may lead to more serious ones if(the problem was)____unsolved.
句中从句主语与主句一致可省略.物作主语,用被动语态,排除A和C,B,remain为不及物动词,没有被动语态,而D,left用法为leave sth.adj,/doing.
再问：我们老师说这个好像是什么句子成分省略，可以详细讲讲吗

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