Every morning Mr.Smith takes a ____to his office .a.20 minutes' walk b.20 minute's walk c.20-minutes walk d.20-minute walk\A 错在什么地方?

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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-minute walk\A 错在什么地方?
Every morning Mr.Smith takes a ____to his office .
a.20 minutes' walk b.20 minute's walk c.20-minutes walk d.20-minute walk\
A 错在什么地方?

Every morning Mr.Smith takes a ____to his office .a.20 minutes' walk b.20 minute's walk c.20-minutes walk d.20-minute walk\A 错在什么地方?
选A的话,前面不能出现a这个不定冠词,否则单数,复数出现混合,不符合语法;
C为正确选项,表示“20分钟的”,被视为一个只做定语的形容词.