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问题: 我错了??还是答案错了?~~

John was lucky enough to win( )prize in the reading conrest.(one)
这里我认为应该填the first。但答案却是first.
序数词前不是应该要加the的吗~~~为什么这里不用加呢??

解答:

you are right
first 为序数词
必须加the