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

试题分析:考查时态和语态。本题的关键在于找出句子的时间状语since该词通常现在完成时连用,根据句意说明本句使用被动语态的形式。句意:—为什么你看上去如此的担忧?—我的电脑坏了。从那以后我的论文就一直被留在没有完成。故B正确。
点评:本题的关键在于找出时间状语since自从,该词通常现在完成时连用。同时还可以改为ever since等。
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