on the portrait mother was deep in thought.A. Fixed her eyesB. Her eyes are fixedC. Her e

问题补充：

on the portrait, mother was deep in thought.

A. Fixed her eyes

B. Her eyes are fixed

C. Her eyes fixing

D. Her eyes fixed

答案：

A. Fixed her eyes

B. Her eyes are fixed

C. Her eyes fixing

(答案→)D. Her eyes fixed

解析：考查独立主格结构。分词作状语时，要求分词的逻辑主语必须是主句的主语。Fixed的逻辑主语是这个动作的承受者，是her eyes,而不是句子的主语mother;所以我们在分词前面把它的逻辑主语Her eyes添上去，形成独立主格结构。