The rules require that you only one guest to the dinner. But they requires A. will bring;

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A. will bring; reforming
B. should bring; to reform
C. bring; reforming
(答案→)D. have brought; to be reformed
解析：C require用作 “要求,命令”时, 后接宾语从句, 要用should +动词原形, should可以省略; require用作“需要”时, 后接动词的-ing形式, 主动形式表示被动意义, 相当于动词不定式的被动结构。