he was the first chinese pianist in the （70-year） history of

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he was the first chinese pianist in the （70-year） history of the competition to win this prize.
he was the first chinese pianist in the 70-year history of the competition to win this prize.
知道中文,括号里是选择的正确答案.A.70 years B.70 year C.70-year D.70-years.为什么选C?要讲题的理由,

70-year 用连字号连起来,作前置定语,修饰history.
其它例如：the 5-year-old girl
the 4-meter-long wall
再问：那其他的呢？
再答： d不能选，连字符前置定语时，不可以用复数70-years.
a. b 都不可以，英语里短语作定语，一般用作后置定语，不能做前置定语。如果多个词要做前置定语，要用连字号，这样他们就算做一个词，可以做前置定语了。
再问：谢谢了

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