---May I smoke here?---If you ________, choose a seat in the smoking section.A.shouldB.couldC.mayD.must
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D解析句意：--在这里我可以吸烟吗？--如果你非要吸，请在吸烟区找一个座位。“if you must do sth.”is always used to say that sb. may do something but you don't really want them to.表示虽不赞同但可允许，意为“如果你偏要/一定要那么做”。