◎ 题干
—You seem tired, David.
—Yes. I _____ all day long and can’t wait to go to bed now.
A.am workingB.had been working
C.have been working D.was working
◎ 答案
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◎ 解析
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◎ 知识点
    根据n多题专家分析,试题“—You seem tired, David.—Yes. I _____ all day long and can’t wait to go to bed now.A.am workingB.had been working C.have been working D.was working…”主要考查了你对  【一般现在时】【将来进行时】【过去完成进行时】【过去将来时的被动语态】  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。