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    精英家教网 > 高中英语 > 题目详情
    —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
    D
    考查时态。Since是现在完成时的标志，essay与leave之间是被动关系。
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