It took us to finish the new work. A. three hour and a half B. three and a half hour C. t

问题补充：

It took us to finish the new work.

A. three hour and a half B. three and a half hour C. three and a half hours

答案：

解析：It takes sb. sometime to do sth.做某事花费某人多长时间。three and a half hours三个半小时，故hour要加s，句意：完成这项新工作要花费我们三个半小时。故选C。