-- Why do you look so worried ?
-- My MacBook Pro broke down and my paper unfinished ever since.
A. left
B. was left
C. has been left
D. has left
网友回答
A. left
B. was left
(答案→)C. has been left
D. has left
解析：考查时态：句意：--你为什么看起来这么担心？-- 我的MacBook Pro坏了，我的论文自从那时还留在那里没有完成。从ever since可知是现在完成时，从paper和leave的关系，可知是被动。选C。