I______ swim in summer when I was young.

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问题 I______ swim in summer when I was young.

选项 A、used to
B、used
C、was used to
D、did used to

答案A

解析 句中的时间状语是when I was young,表示过去,因此应选A项。“used to+动诃原形”意为“过去常常做某事(而现在不做了)”。
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