根據(jù)要求改寫句子Mr．Green questioned his son．He learned how to play with the machine from his son．(把兩個句子合并為含介詞＋關(guān)系詞引導的定語從句的復(fù)合句)

答案：
解析：

Mr．Green questioned his son from whom he learned how to play with the machine．


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