Unfortunately, _____ stone hit him on ______ head and he got injured. [ ]

A. the; a

B. a; 不填

C. a; the

D. the ; the

髌骨软骨软化症的治疗原则哪项是错误的

A．关节内封闭

B．物理治疗

C．非甾体类抗炎药

D．股四头肌锻炼

E．一旦发现尽可能早手术治疗