问题补充：
The children all turned the famous actress as she entered the classroom.
A. looked at
B. to look at
C. to looking at
D. look at
答案：
A. looked at
(答案→)B. to look at
C. to looking at
D. look at
解析：句意：当著名的电影演员进入教室的时候，所有的人都扭头去看她。这里是turn to look at 扭头去看。根据句意故选B。
