--- May I smoke here?
--- If you , choose a seat in the smoking section.
A. should
B. could
C. must
D. may
网友回答
A. should
B. could
(答案→)C. must
D. may
解析：考查情态动词。Should 意为应当，竟然 could 可能，能够 must必须，一定，非要，偏要 may可能，可以
句意为，----我可以在这吸烟吗？
-----如果你偏要吸的话，选择吸烟区的座位。