问题
选择题
Three fourths of the homework _________ today.
A．has done
B．has been done
C．have done
D．have been done
答案
答案：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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