Three fourths of the homework today.A. has doneB. has been doneC. have doneD. have been d

问题补充：

Three fourths of the homework today.

A. has done

B. has been done

C. have done

D. have been done

答案：

A. has done

(答案→)B. has been done

C. have done

D. have been done

解析：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。