◎ 题干
—Have you got your exam papers?
—Not yet. I guess they ________ at this moment.
[     ]
A. are being graded  
B. are grading
C. have graded  
D. have been graded
◎ 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“—Have you got your exam papers?—Not yet. I guess they ________ at this moment.[ ]A. are being gradedB. are gradingC. have gradedD. have been graded …”主要考查了你对  【现在进行时的被动语态】  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。