—No one was prepared for the teacher's questions.

—We________read the lesson yesterday evening.[ ]

A. must have  

B. could have  

C. should have  

D. might have

治阴疽流注及痰阻肢体麻木关节肿痛之证的首选药物为

A．半夏
B．白附子
C．天南星
D．白芥子
E．黄药子