The programme was so exciting that the children kept their eyes on the screen.A. to fixB.

问题补充：

The programme was so exciting that the children kept their eyes on the screen.

A. to fix

B. fixed

C. to be fixed

D. fixing

答案：

A. to fix

(答案→)B. fixed

C. to be fixed

D. fixing

解析：句意，这个节目如此激动人心以致于孩子们全神贯注看着屏幕。fix ones eyes on ...表示注意看...，eyes提到动词fix前面，两者形成被动关系，故fix应用过去分词。