【题目】It is politely requested by the hotel management that radios ______ after 11 o'clock at night.
A.were not played
B.not play
C.not be played
D.did not play

【答案】C
【解析】句意：旅馆管理部门恳请客人晚上11点后不要打开收音机。句中的谓语动词request(请求)所引出的从句应当用虚拟语气，即动词原形或“should+动词原形”。本句的主语从句中，主语radio是谓语动词play 的客体，谓语应当用被动语态。所以，答案是C.