A great number of students said they were forced to practice the piano.
A. to question
B. to be question
C. questioned
D. questioning
网友回答
A. to question
B. to be question
(答案→)C. questioned
D. questioning
解析：句意：许多被提问的学生都说他们被强迫练习钢琴。这里students与question之间是被动关系，用过去分词作定语来修饰students，故选C。