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    精英家教网 > 高中英语 > 题目详情
    Three fourths of the homework _________ today.
    A．has doneB．has been doneC．have doneD．have been done
    B
    homework 是不可数名词，它的四分之三也是不可数名词，所以排除C，D;且homework 和do是动宾关系，所以要用被动语态。所以选B。
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