答案：D.
翻译：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后悔不迭的话出来.
此题考查含蓄的虚拟语气.
1.otherwise翻译为“否则”时,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”.
2.如：We need oxygen.Otherwise,we would die soon.
= We need oxygen.If we had no oxygen,we would die soon.
此句是对现在情况的虚拟.
再如：He didn't go out last night.Otherwise,he would have met you.
= He didn't go out last night.If he had gone out last night,he would have met you.
3.此题请楼主注意前句：Yesterday,Jane walked away from the discussion.
它使用了一般过去时,所以后句是对过去情况的虚拟.
可以同样做如下理
Otherwise,she might have said something she would regret later.
= If she hadn't walked away from the discussion,she might have said something she would regret later.