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When he was young, he swim in the river. [ ] A.is used toB.was used to C.used to

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When he was young, he swim in the river. [ ] A.is used toB.was used to C.used to

When he was young, he ________swim in the river.

[]

A.is used toB.was used toC.used toD.use to

试题答案

答案:C