问题标题：
【ThequietnessoftheReferenceRoomintjeunversitylibrarywasbrokenonlybyanoccadionalcoughandthenbythehardlyaudiblesoundofpages_______.A.tobeturnedB.tohavebeenturnedC.beingturnedD.havingbeenturned】
问题描述：
ThequietnessoftheReferenceRoomintjeunversitylibrarywasbrokenonlybyanoccadionalcough
andthenbythehardlyaudiblesoundofpages_______.
A.tobeturnedB.tohavebeenturnedC.beingturnedD.havingbeenturned
孙连坤回答：
C大学图书馆参考室很安静,只有偶尔的几声咳嗽声和几乎难听见得翻书声.
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