--Have you finished your work yet?
--Yes, I have . It half an hour ago.
A. has been finished
B. finished
C. was finished
D. has finished
网友回答
A. has been finished
B. finished
(答案→)C. was finished
D. has finished
解析：句意：你已经完成你的工作了吗？——是的，我完成了。它是一个小时前完成的。It是完成的对象，故用被动语态，结合时间状语an hour ago，可知为过去时态，故选C。