In the reading room we found her seated at a desk her attention on a novel.A. fixingB.

问题补充：

In the reading room, we found her seated at a desk, her attention on a novel.

A. fixing

B. to fix

C. fixed

D. having fixed

答案：

A. fixing

B. to fix

(答案→)C. fixed

D. having fixed

解析：句意：在阅览室，我们发现她坐在书桌旁，她的注意力集中在一本小说上。这里含有一个独立主格结构，“her attention”与“fix”之间是被动关系，故用过去分词，选C。