问题补充：
.All the students were listening carefully, with their eyes on the teacher.
A. fixed
B. being fixed
C. fixing
D. to fix
答案：
A. fixed
(答案→)B. being fixed
C. fixing
D. to fix
解析：考察非谓语动词.句意,所有学生都在认真听见,眼睛看着老师.现在分词表示真在发生的,伴随性的动作,眼睛是fix的动作对象,故用被动语态,选B.
