the boy is swiming in the rive这个英语句子有毛病吗?重点：我想问一下是on the river还是in the river

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• the boy is swiming in the rive这个英语句子有毛病吗?重点：我想问一下是on the river还是in the river
• the boy is swiming in the rive这个英语句子有毛病吗?重点：我想问一下是on the river还是in the river
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• 英语:“一艘小船在河里”,是用on the river还是in the river?(A boat is _____ the river.)简单的问题要速度！！