以下句子中,一共有几个定语从句? However, even the president Tacqueville, whopredicted 150 years ago that the United States and Russia would emerge as two great contending world powers could not have foreseen that the nation that potentially could decide the world balance of power in the last decades of the twentieth century, and that could become the most powerful nation on earth during the twenty-first century, would be China. A. 1 B. 2 C. 3 D. 4