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My cousin won the     race  at the sports mee

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My cousin won the     race  at the sports meeting.

A.100 metres  B.100 meter  C.100-metre D.100-metre's
In school ,more     should be paid to students' sports activities.
A.attention  B.development 
就俩道,麻烦给下解析
My cousin won the     race  at the sports mee
1 C.100-metre,这种做形容词用的数量词,就这么写
2 attention,关系,注意
再问: 怎样区别A,和C这俩个短语的用法?
再答: A 100 metres 是数词。比如:The track measures 100 metres. C.100-metre ,是合成词,用作形容词。
再问: 那是不是不能用 the 100 metres race?数词后面不可以跟名词?
再答: 不行。