◎ 题干
—Why do you look so worried?
—My computer broke down and my essay ________ unfinished since.
[     ]
A. had left  
B. has left
C. was left  
D. has been left
◎ 答案
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◎ 解析
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◎ 知识点
    根据n多题专家分析,试题“—Why do you look so worried?—My computer broke down and my essay ________ unfinished since.[ ]A. had leftB. has leftC. was leftD. has been left…”主要考查了你对  【现在完成时的被动语态】  等知识点的理解和应用能力。关于这些知识点的“档案”,你可以点击相应的链接进行查看和学习。