供应宴会用的各种饮料、酒水根据需要在开席前（）进行冷藏，确保客人席间的需求。
A、四小时
B、两、三小时
C、一小时
D、一天
参考答案：C
— Listen! Is that Kangkang playing the guitar?
— No. It ______ be Kangkang. He has gone to Changsha. [ ]
A. can't
B. needn't
C. mustn't
疼痛弧是冈上肌腱炎的特征。（）
