Three fourths of the homework today.A. has finishedB. has been finishedC. have finishedD.

问题补充：

Three fourths of the homework today.

A. has finished

B. has been finished

C. have finished

D. have been finished

答案：

A. has finished

(答案→)B. has been finished

C. have finished

D. have been finished

解析：考查时态及主谓一致。句意：今天有四分之一的作业被完成了。可知本句描述的是现在已完成的动作。当前面有分数修饰时，谓语动词与被修饰词保持一直，homework为抽象名词不可数，故谓语动词用单数，选B。