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11．當他僅有四歲的時候就開始寫音樂了．（at the age of）
Hestarted writing music at the age of four．．

分析 He started writing music at the age of four．

解答答案：He started writing music at the age of four．表達的是過去的事情用一般過去時，at the age of+基數詞表達的是在…歲的時候，start doing sth開始做某事，write music寫音樂，故答案是He started writing music at the age of four．

點評 at the age of…：是在…歲時，表示的是一個時間點；如：He became an actor at the age of 16．（他16歲時成為了一個演員．）

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