选B
解析：warn sb against/about sth劝告(使有所防备)；警告；告诫
warn sb of sth提醒注意（可能发生的事）；使警惕
原文意思是医生警告病人要远离烟所以选B好一些.
the doctor warned the patient ____ smoking A of B against C at D for
the doctor warned the patient ____ smoking A of B against C at D for
英语人气：397 ℃时间：2020-03-23 07:56:00
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