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

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(答案→)A. fixed
B. fixing
C. fix
D. to be fixing
解析：考查with+n.+doing 复合结构。Fix one’s eyes on结构中名词和动词之间为被动关系，凝视-----，为固定短语，故用fixed。