after ( ) walk , you will find the library. 答案为什么是B?理由是什么?A five _英语解答

after ( ) walk , you will find the library. 答案为什么是B?理由是什么?
A five minutes B five minutes' C five-minute's D a five-minute

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解答

five minutes' （整体作形容词）,等于 a five-minute-walk ,walk前有个连字符