Item a is correct. "The three armed forces can win the position of commander-in-chief, but ordinary people can't win the ambition" comes from The Analects of Confucius Zi Han, which means that the commander-in-chief of the army can change, but the ambition of ordinary people can't change. Item b is wrong. "Don't spread the word and hide the virtue" comes from Zuo Zhuan Xi Gong 33 years. Item c is wrong. "Don't blame others, don't treat others with yourself" comes from Mencius' Gongsun Chou. Item d is correct. "Virtue is not alone, there must be neighbors" comes from The Analects of Confucius, which means that a moral person will not be lonely and must be accompanied by like-minded people. Therefore, this question chooses AD.