The teacher's eyes, without any expression, the boy who made faces.
A. watched
B. stared at
C. glared at
D. were fixed upon
网友回答
A. watched
B. stared at
C. glared at
(答案→)D. were fixed upon
解析：watch,stare,glare的主语只能是人,只有D构成fix one's eyes on ／ upon sth. .