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-80% of our work --finished.-really?it's--hard work,you know

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-80% of our work --finished.-really?it's--hard work,you know.A have been,such Bhas been,such C h...
-80% of our work --finished.-really?it's--hard work,you know.A have been,such Bhas been,such C has ,such a D is,so
C肯定是错的嘛,work是不可数n,job才是可数的~
-80% of our work --finished.-really?it's--hard work,you know
work在这里是作为不可数名词,但是80% of our work是作为单数名词,所以后面是has been finished或is finished,前者finished是动词过去分词,后者finished是形容词.hard work里的 work是不可数名词,前不能加不定冠词a.such(a)用在名词前(带或不带形容词).so用在形容词前(不带名词).so不能修饰起前置修饰作用的形容词hard.so更不能置于以不可数名词work为中心词的名词短语之前.所以不能用so,综上所有条件,选择B选项.