had been done和 had done有什么区别呢?

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• 一个英语句子,关于had been done
• And now murder had been done,and you are as guilty of that as if you had struck the blow yourself!’
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• it was done 和 It has been done 的区别能否有谁帮我解释这两个句子的区别?不要说一个是过去式一个是完成时哦.