John said his mother would buy him a five-speeds racing bicycle for his sixteenth birthday.

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问题 John said his mother would buy him a five-speeds racing bicycle for his sixteenth birthday.

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答案five-speeds——five—speed/five speeds’

解析 在表示时间,距离,金钱,度量的名词既可以用所有格形式表示,也可以和数词一起组成作定语的复合结构。但名词都要用复数。该复合结构还可跟一个由连字符连接的合成形容词,但名词要用单数。
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