◎ 题干
-- I have got a headache.
-- No wonder. You_________ on the math exercises too long.
A.work B.are working C.have been working D.worked
◎ 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“-- I have got a headache. -- No wonder. You_________ on the math exercises too long. A.workB.are workingC.have been workingD.worked…”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。