问题
选择题
Three fourth of the homework _______ today .
A．has finished
B．has been finished
C．have finished
D．have been finished
答案
答案：B
考查主谓一致和时态与语态。句意“今天作业的3/4已经被做完了。”homework是不可数名词，谓语用单数，排除C、D；homework和finish之间是被动关系，应该用被动语态。故选B。