Everything that can be done has been done,___?

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Everything that can be done has been done,___?
A.can't it
B.can it
C.hasn't it
D.has it
答案选C．请给我讲讲,

1.一般带从句（包括定语从句）的句子的反意疑问句,是反主句主语,这个句子就是反主句主语,这个句子的主句是Everything has been done,所以用hasn't it ,注意,在这主语是Everything,所以用it来代替.如果主语是everybody或者everyone,要用they代替主语,明白吗?
2.如果带从句（包括定语从句）的句子的主语是第一人称（I,we),则句子的反意疑问句是反从句.
明白我说的吗?

Everything that can be done has been done,___? has everything that can be done been done句子里的that能不能省略,为什么?如 Everything can be done has been done.请问这里can be done 用的是什么时态 all that can be done has been done Has all that can be done been done? all that can be done has been done. all that can be done been done. all that can be done has been done 为什么要用has,不用have all that can be done has been done.中的that为 nothing that can be done has been done 可省that吗 I don't think anything that has been done can be done.怎么翻译 Everything _____ has been done