When the exam is held ,the only sound you can hear is the sound of the papers’()A being turned B to be turned C turned D having been turned

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When the exam is held ,the only sound you can hear is the sound of the papers’()
A being turned B to be turned C turned D having been turned

选A,the papers'是名词所有格,后应跟名词形式,感官动词hear和整句时态可把D排除

A