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2．A friend of mine oftenswam（swim） in the river when he was young．

分析我的一個朋友在他年輕的時候經常在這條河里游泳．

解答答案：swam．
一般過去時表示過去某個時間里發生的動作或狀態；過去習慣性、經常性的動作、行為．根據"when he was young"當他年輕的時候，是一個表示過去的時間狀語，所有主句要用一般過去時，結合給出的英語提示"swim"所以要用swim的過去式swam，故填swam．

點評首先要掌握一般過去時的用法，然后結合具體的題目，就可以確定正確答案．

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