All______has already been done.

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问题 All______has already been done.

选项 A、can be done
B、should be done
C、that can be done
D、what should be done

答案C

解析考查定语从句。这里all是主语，has been done是谓语，所以中间是修饰all的成分，是定语从旬。当先行词是不定代词时，只能用that引导。故选C。

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