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- May I smoke here, Smith? - If you , choose a seat in the smoking section. [ ]A

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- May I smoke here, Smith? - If you , choose a seat in the smoking section. [ ]A

— May I smoke here, Smith?    
— If you _______, choose a seat in the smoking section.  [     ]A. should    
B. could        
C. must        
D. may

试题答案

C