the right decision the future is probably the most important thing we will ever do in ou

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A. Making; concerned
B. Make; concerning
C. To make; concerned
(答案→)D. Making; concerning
解析：考查动名词做主语和现在分词作定语，第一空填making，是动名词做定语，第二空填concerning，concerning the future 属于现在分词作定语修饰the right decision 翻译过来是“关于未来的正确决定”，句意：做出关于未来的正确决定是我们一生中做的最重要的事情。选D。