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?

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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?
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?

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.

选B 如果中间的连字符去掉就应该是thirty minutes‘

A，固定结构而已

A 形容词做定语

A 两个名词用连字符连起来就构成了一个形容词，例如man-made（人造的），这里的A也可以写成half-an-hour，B应去掉连字符，C去S

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