The students are listening to the teacher with their eyes the blackboard.A. fixing onB. fi

问题补充：

The students are listening to the teacher with their eyes the blackboard.

A. fixing on

B. fixing to

C. fixed on

D. fixed to

答案：

A. fixing on

B. fixing to

(答案→)C. fixed on

D. fixed to

解析：fix与其逻辑主语their eyes是被动关系，故用过去分词，构成with +名词/代词+过去分词的独立主格结构。