◎ 题干
Tom ________ in the library every night over the last three months.(2011·北京)
A.works B.worked
C.has been working D.had been working
◎ 答案
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◎ 解析
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◎ 知识点
    根据魔方格专家分析,试题“ Tom ________ in the library every night over the last three months.(2011·北京)A.worksB.workedC.has been workingD.had been working…”主要考查了你对  【现在完成时】【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。