The silence of the library is sometimes broken by a sudden cough or the sound of pages .
A. turning
B. turned
C. being turned
D. having turned
网友回答
A. turning
B. turned
(答案→)C. being turned
D. having turned
解析：考查非谓语动词，turn的逻辑主语是pages，书页和翻动之间是被动关系，因此排除AD, 因为turn前面有of，介词，后面要用doing的形式，因此选择C
句意为，图书馆的寂静有时候会突然的咳嗽或者翻书的声音打破。