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。