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：当那位著名的女演员走进了教室，所有的孩子都转过头去看她。turn to表示“转向，求助”的意思。
