Half of the work by now. A. has finished B. has been finished C. have been finished

问题补充：

Half of the work by now.

A. has finished B. has been finished C. have been finished

答案：

解析：考查动词的被动语态。 句意：一半的工作已经被完成。可知要用被动语态结构，work是不可数名词，所以用单数has been finished，故选B。