【题目】If you_______ smoke, please go outside.
A. can B. should C. must D. may
在线课程【答案】C
【解析】
试题分析：考查情态动词和虚拟语气。A. 可以；B. 应该；C. 必须；D. 或许。句意：如果你必须要吸烟，请到外面去。故选C。
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