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— Why do you look so worried? 
— My MacBook Pro broke down and my paper ______ unfinished since.        
A.has beenleftB.hasleftC.leftD.hadbeenleft
A

试题分析: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。
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