—May I smoke here ?—If you choose a seat in the smoking section. A. shouldB. couldC. may

问题补充：

—May I smoke here ?

—If you , choose a seat in the smoking section.

A. should

B. could

C. may

D. must

答案：

A. should

B. could

C. may

(答案→)D. must

解析：must在这两道试题中均表示“非得，偏要”。