The village is far away from here indeed ．It's almost_________ ride．A.a four hourB.a four hour'sC.four hoursD.four hours'
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D解析数词+单位量词修饰可数名词有两种方法：(1)不定冠词+数词+连字符+单位量词的单数形式(如：a two-hour ride)。(2)a／an+单位量词的单数形式+'s(如：an hour's ride)和大于1的数词+单位量词的复数形式+'s(s一般情况下省去)(如：four hours'walk)．