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- Why do you look so worried?
- My MacBook Pro broke down and my paper______unfinished since.
A.was leftB.has left
C.leftD.has been left
D

试题分析:考查时态。since后省略了“it broke down”,since+含有一般过去时的句子,与现在完成时连用;排除A、C;my paper和leave是动宾关系,用被动语态,故选D。
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