选A
这里done和left是并列的谓语,根据前面的have done,说明后面应该填（have）left{在句中分别都要用完成时}.
翻译：我们已经做了那些我们本不应该做的事,并留下那些我们本该做却没有做的事情.
英语翻译We have done things we ought not to have done and ( )und
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