About 15 minutes to ride a bike bike 这个句子有错误吗

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• About 15 minutes to ride a bike bike 这个句子有错误吗
• a 20 minutes' walk和 a 20-minute walk 有什么不同?1.every morning Mr.Smith takes a ________to his office.A.20minutes' walk B.20minute's walk C.20minutes walk D.20-minute walk这里选D 为什么不能选A呢2.My home is about ______from my school.A.15 minutes B.10-minute ride C.20 minutes' by bike D.15-minute's on foot这里选B 为什么前面不加a呢?
• About 15 minutes to ride a bike bike 这个句子有错误吗
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