单选题 His business prospered and he became a person of means. Yet, despite his great riches, he gave no arms to the needy and no thanks to his benefactors whose savings ______ to his welfare.
【正确答案】 A
【答案解析】整个句子讲的是过去的事情，选过去完成式表示contribute这一动作发生在give之前。