Yesterday, Jane walked away from the discussion. Otherwise, she something she would regret

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A. had said
B. said
C. might say
(答案→)D. might have said
解析：句意：昨天Jane走开了没有参加讨论。否则的话，她可能会说出一些她以后后悔不迭的话出来。
这里otherwise翻译为“否则”，= If she hadn't walked away from the discussion,其后的句子经常会使用虚拟语气。其句子结构等同于if引导的条件状语从句虚拟语气中主句的结构变化。即：如果是对现在/将来情况的虚拟，句子谓语使用“would/could/might do sth”。如果是对过去情况的虚拟，句子谓语使用“would/could/might have done sth”。所以选D。