20-dollar 与20 dollars的区别he won a ( ) prize in the competion应该是20-dollar 还是20 dollars?有什么区别?

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20-dollar 与20 dollars的区别he won a ( ) prize in the competion应该是20-dollar 还是20 dollars?有什么区别?
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20-dollar 与20 dollars的区别he won a ( ) prize in the competion应该是20-dollar 还是20 dollars?有什么区别?
20-dollar 与20 dollars的区别
he won a ( ) prize in the competion
应该是20-dollar 还是20 dollars?
有什么区别?

20-dollar 与20 dollars的区别he won a ( ) prize in the competion应该是20-dollar 还是20 dollars?有什么区别?
是20-dollar对 ( 相当于形容词‘ 20美元的’ )
因为20 dollars后不能接名词.
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