◎ 题干
At the beginning of class, the raise of desks        could be heard outside the classroom.    
[     ]
A. opened and closed             
B. to be opened and closed    
C. being opened and closed    
D. to open and close
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◎ 解析
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◎ 知识点
    根据n多题专家分析,试题“At the beginning of class, the raise of deskscould be heard outside the classroom.[ ]A. opened and closedB. to be opened and closed C. being opened and close…”主要考查了你对  【现在分词的被动式】  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。