The quietness of the Reference Room in tje unversity library was broken only by an occadional cough
问题描述：
The quietness of the Reference Room in tje unversity library was broken only by an occadional cough
and then by the hardly audible sound of pages_______.
A.to be turned B.to have been turned C.being turned D.having been turned
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.