He argued smoking, and insisted that it was argument that smoking was harmful to health.A

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A. for; beyond
B. against; over
C. for; over
(答案→)D. against; beyond
解析：考查介词。句意：他反对吸烟而且坚持认为吸烟有害健康是无可争辩的。根据短语：argue for 支持argue against 反对排除A和C，根据固定短语：beyond argument 无可争辩的，所以D正确。