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 本题考查定语从句。句意:所有能做的都已经做完了。定语从句先行词是all,时,引导词用that且不可省略,此时all that等同于what,all同时还是整句话的主语,所以答案为C。
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