— There was a lot of fun at yesterday's party. You ________ come. Why didn't you?

— What a pity! But I had no time because I had lots of homework to do. [      ]

A. must have  

B. should

C. need have  

D. ought to have

慢性疼痛的治疗，应尽量避免使用（）。

A、行为治疗

B、针刺治疗

C、运动治疗

D、冷疗

E、麻醉类镇痛药治疗