.He was deep in thought with his eyes on the ceiling.A. fixedB. fixingC. fixD. to be fixin

问题补充：

.He was deep in thought with his eyes on the ceiling.

A. fixed

B. fixing

C. fix

D. to be fixing

答案：

(答案→)A. fixed

B. fixing

C. fix

D. to be fixing

解析：考查with的复合结构，句意：他陷入沉思眼睛集中在天花板。短语：fix one’s eyes on 眼睛集中在什么上，题中的with 结构中his eyes 在前面，所以用过去分词，选A。