There's no light on in the dormitory. They must have gone to attend the concert to be held on the

campus, ________?[ ]

A. didn't they  

B. mustn't they

C. haven't they  

D. shouldn't they

患者，男，47岁。3个月来阴囊湿疹，瘙痒难忍，搔破则流黄水，以致夜不成眠，小便短赤，舌红苔黄腻，脉滑数。其证候是()

A．肝胆湿热

B．肝胆火盛

C．肾阴虚亏

D．肾气不固

E．湿热蕴脾