2. 外语
  3. He (use) ______ swim in that river when he was a little boy.

He (use) ______ swim in that river when he was a little boy.

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问题 He (use) ______ swim in that river when he was a little boy.
选项
答案used to
解析 本题考查固定结构的用法。句子中的时间状语when he was a little boy表示的是过去的时间，used to意思是“过去常常做某事”，用在此处同时符合语法要求和句意要求。
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