— Why do you look so worried?
— My MacBook Pro broke down and my paper unfinished since.
A. has beenleft
B. hasleft
C. left
D. hadbeenleft
网友回答
(答案→)A. has beenleft
B. hasleft
C. left
D. hadbeenleft
解析：句意：—你为什么看上去那么担心？ —我的苹果笔记本坏了，从那以后我的论文就搁置没完成。since提示用现在完成时，论文被放一边，用被动语态。 has been left现在完成时的被动语态； has left 现在完成时的主动语态；left一般过去时的主动语态；had been left过去完成时的被动语态。故选A。
考点: 考查时态和语态的用法。