Every morning Mr.Smith takes a___walk _to his office. A .20 minute's B..20--minute 答案是B.为什么不是A

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Every morning Mr.Smith takes a___walk _to his office. A .20 minute's B..20--minute 答案是B.为什么不是A
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Every morning Mr.Smith takes a___walk _to his office. A .20 minute's B..20--minute 答案是B.为什么不是A
Every morning Mr.Smith takes a___walk _to his office. A .20 minute's B..20--minute 答案是B.
为什么不是A

Every morning Mr.Smith takes a___walk _to his office. A .20 minute's B..20--minute 答案是B.为什么不是A
A 如果是20 minutes' 就对了
专业团队献上最专业的解答

a 应该是 20 minutes'就对了

A错,应该是20 minutes'(注意,有一个'的符号)

B相当于形容词 而A应是20 minutes'