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— Why do you look so worried?
—My computer broke down and my essay ______ unfinished since.
A.had leftB.has leftC.has been leftD.was left
C

试题分析:上文意思是“你为什么看起来这么为难?”,下文意思为“我的电脑坏了,我的散文还没有写完”,表示过去的某一动作或行为一直持续到现在,所以用现在完成时,又因为 “ essay”与“leave”是被动关系,故用现在完成时的被动语态,故选C。 
点评:解答此类时态题,一定要把题目读完整,理解意思后,具体问题具体分析,选择合适的时态。时间状语也是一个很好的判断依据。
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