翻译：我们公司始终保持为人的理念、始终保持快速的营销体系，坚持提供优质的售后服务。 A: We always keep the concept for people,insisit on fast marketing system and provide good after-sale service. B: We always keep the concept for people, the quick marketing system and good after-sale service. C: Keeping the concept for people, quick marketing system and good after-sale service. D: We aim at the concept for people, quick marketing system and good after-sale service.