In the reading room we found her at a desk with her attention on a book.A. sitting; f

问题补充：

In the reading room, we found her at a desk, with her attention on a book.

A. sitting; fixing

B. seated; fixed

C. sit; fixing

D. sitting; to be fixed

答案：

A. sitting; fixing

(答案→)B. seated; fixed

C. sit; fixing

D. sitting; to be fixed

解析：句意：我发现她坐在阅览室里的一个桌子旁边，集中精力在读一本书。这里是固定短语find sb doing/done发现某人在做某事/被怎样，其中sb与do之间是主动关系；her与sit之间是主动关系；因为sb be seated某人坐着，her与seat之间是被动关系，故用过去分词，所以根据第一空排除C；第二空是with的符合结构；fix one’s attention on…集中精力于；with one’s attention fixed on…这时attention与fix之间是被动关系，所以用过去分词，故选B。