问题
选择题
— May I smoke here?
— If you ________, choose a seat in the smoking section.
[ ]
A. should
B. could
C. must
D. may
答案
答案：C
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— May I smoke here?
— If you ________, choose a seat in the smoking section.
A. should
B. could
C. must
D. may
答案：C