—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：这是一组对话。上文，我可以在这里吸烟吗？下文，如果你必须吸烟的话，在吸烟区选择一个座位。Must表示必须，故选D。

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