–Why do you look so upset?
–The electricity was cut off suddenly and my essay unfinished since.
A. was left
B. has left
C. left
D. has been left
网友回答
A. was left
B. has left
C. left
(答案→)D. has been left
解析：
试题分析:句意：——你为什么看上去这么沮丧呢？——突然停电了，从那时我的文章就没写完。根据句中的since判断句子应该用现在完成时，而essay和动词leave之间是被动关系，故答案选D。