Every morning Mr.Smith takes a____to his office.A.20 minutes'walk B.20 minute's walk C.20-minutes walk D.20-minutes walk

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Every morning Mr.Smith takes a____to his office.A.20 minutes'walk B.20 minute's walk C.20-minutes walk D.20-minutes walk
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Every morning Mr.Smith takes a____to his office.A.20 minutes'walk B.20 minute's walk C.20-minutes walk D.20-minutes walk
Every morning Mr.Smith takes a____to his office.
A.20 minutes'walk B.20 minute's walk C.20-minutes walk D.20-minutes walk

Every morning Mr.Smith takes a____to his office.A.20 minutes'walk B.20 minute's walk C.20-minutes walk D.20-minutes walk
A.20 minutes'walk
20分钟的路程
也可以说成 20-minute-walk

A吧?有了连字符就不能加s了。。

选A 20 minutes' walk
B不对,是因为minute用了单数形式
CD不对,假如要用横杠,就是这种形式 20-minute‘s walk 而不用minute的复数形式了
为什么C和D是一样的?

A. 20 minutes'walk 是复数名词20 minutes 的所有格 :复数名词所有格在复数后加S。
也可以这样用 20-minute walk 。