有一读者问：有这样一道选择题：
(1)The programme was so exciting that the children kept their eyes_________on the screen.
A. to fix B. to be fixed C. fixed D. fixing
答案是C，为什么不选D?
当 fix 意指“使（眼睛）指向”时，是一及物动词，所以这里 kept their eyes 之后须用表被动的过去分词 fixed, 再如：
(2)He stood there with his eyes fixed on the picture.
