B
done是过去分词, having been done是现在分词完成时的被动语态.两个都可以表示“完成＋被动.”但作状语时,having been done表示该动作发生在主句动作之前； 而done则不强调这层含义；
having been done 的否定形式为not having been done
（ ）for a couple of months,the house was in a mess.
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