A new study proves a [ ]walk every day is enough to keep peo

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A new study proves a [ ]walk every day is enough to keep people away from becoming fat.
A .thirty-minute B.thirty-minute's C.thirty-minutes 哪个选项,为什么?

选A
C不正确,合成形容词的名词组成全部用单数,不能用minuteS复数
B词性错误,合成的thirty-minute是形容词,比如 3-year-old boy 的 3-year-old,不能加所有格 's.
再问：可是参考答案选的是C。我弄不明白。麻烦您在解释
再答： http://edu.sina.com.cn/en/2005-02-06/30555.html 或许答案错了，教辅书答案有错的。。。我读中学时每年都有错答案的教辅。

A new study proves a [ ]walk every day is enough to keep peo A new study proves a_________walk every day is enough to kee I____home every day.A/walk to B/walk C/walk Every day is a new day . He is going to walk to the park() A.this evening B.every day Lucy is used to (having) a walk after supper every day 为什么是h 改为复数.1.is it a country?2 .does he walk to school every day?3 I keep a()to help me remember ghings every day.. We hope that every day a happy day to study well and every d I keep a d() every day if you don't have enough time to walk dogs once a day,you ( ____healthy,we must exercise every day A keep B to keep c ke