receive a letter from sb侧重信的来源
receive a letter of sb 侧重所属关系, 指“谁的来信”
强调点不同

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祝学习进步有例句吗注意， 一般只习惯于说receive a letter fom如：I received a letter from Tom yesterday.=I heard from Tom yesterday=Tom's letter reached me yesterday.我昨天收到汤姆的信