这句句子有错误， 应该是 Never before had a sport become such a powerful instrument of peace and friendship between two nations!该句是一句过去完成时的倒装句，原本应该是这样 A sport had never become such a powerful instrument of peace and friendship between two nations before. 现在把never 和 before提前，had 放到 主语 a sport前面...
正常语序是： A sport had never become such a powerful instrument of peace and friendship between two nations before. becomes错了，应该是become.had这里不是动词，had become是过去完成时...
