第24题: [单项选择]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. A. had contributed. B. contributed C. were contributed D. did contribute 参考答案: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。