Dr. Smith was always the poor and the sick, often providing them with free medical care.A.

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A. tended by
B. absorbed in
C. reminded of
(答案→)D. concerned about
解析：be absorbed in专心于，全身贯注于；be concerned about关心，挂念；remind sb of提醒某人某事；tend sb照管某人；句意：史密斯博士总是关心那些穷人和生病的人，经常提供给他们免费的医疗服务。根据句意故选D。