题目内容

- 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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