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At the beginning of class, the noise of desks could be heard outside the classro

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At the beginning of class, the noise of desks could be heard outside the classro

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

 

试题答案

C

标签：desksnoisebecouldclass

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