several important decisions based on emotion instead of reason, he felt bitterly regrett

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A. Making
(答案→)B. Having made
C. Made
D. To make
解析：选B　考查非谓语动词。句意：出于情感而不是理智作了好几个重大决定，他感到极其后悔。分析句意可知，he与make之间构成逻辑上的主谓关系，且动词make发生在felt之前，故应用动词­ing形式的现在完成式作原因状语。