At the beginning of class, the noise of desks _____ could be heard outside the c
题型：不详难度：来源：
At the beginning of class, the noise 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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答案
| C |
解析
| 此处表示被动和进行，故答案为C，现在分词的被动语态做定语。 |
举一反三
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