every morning Mr.Smith takes a to his office A.20 minutes' walk B.20-minute walk同上 我觉得答案是B ,不过我记得这题以前做过,应该是B啊.

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every morning Mr.Smith takes a to his office A.20 minutes' walk B.20-minute walk同上 我觉得答案是B ,不过我记得这题以前做过,应该是B啊.
every morning Mr.Smith takes a to his office A.20 minutes' walk B.20-minute walk
同上 我觉得答案是B ,不过我记得这题以前做过,应该是B啊.

every morning Mr.Smith takes a to his office A.20 minutes' walk B.20-minute walk同上 我觉得答案是B ,不过我记得这题以前做过,应该是B啊.
选B
a 20-minute walk 就是冠词+形容词+名词 构成
20-minute 在这里是变形的形容词用法 就相当于 a 2-year-old boy
希望这样能让你理解

选A,因为B的正确答案应为20-minute-walk

选B,a 20-minute walk= 20 minutes' walk

选B
前面有个a,20-minute是形容词,walk是名词