◎ 题干
At the beginning of class, the noise of desks _____ could be heard outside the classroom.
A.opened and closedB.to be opened and closed
C.being opened and closedD.to open and close
◎ 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“At the beginning of class, the noise of desks _____ could be heard outside the classroom. A.opened and closedB.to be opened and closedC.being opened and closedD…”主要考查了你对  【现在分词的被动式】【现在分词】【不定式的被动式】【过去分词】  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。