The silence of the library was sometimes broken by an occasi

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The silence of the library was sometimes broken by an occasional cough or by the
sound of pages _______.
A.turned B.having turned
C.to be turned D.being turned为什么填being turned?这里面不是非谓语动词作定语吗?求讲解,

填D
被动语态作定语.
A和B是主动语态
C时态不对.
再问：非谓语动词作定语不是主动表被动吗？这里有什么时态，所有to be都表将来时态吗？
再答：参考一下http://wenku.baidu.com/link?url=YjYvIYw9bFodKNm6zffBqlAFpWHIOSez2RVlvKhn8yZvkWx2g6JjAX_iLELcgm9Xwc6EH_oN47FqHo57TWiAx8uYmXQ9caRvY7uO8IF58dC hope it can help you.

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