单选题The teacher's eyes  witho

问题补充：

单选题Theteacherseyes,withoutanyexpression,_____theboywhomadefaces.A.watchedB.stared atC.glared atD.were fixed upon

答案：

D解析watch,stare,glare的主语只能是人,只有D构成fix ones eyes on / upon sth. .