题目内容
4．I got a diamond necklace as a present on myfortieth（四十） birthday．分析 在我四十岁生日的时候我获得了一条钻石项链作为生日礼物．
解答 答案：fortieth．结合句意是说在我四十岁生日的时候，也就是第四十个生日，用序数词fortieth，前面有形容词性物主代词my修饰，故省略the，故答案是fortieth．
点评 当序数词前有形容词性物主代词或名词所有格修饰时，序数词前不用 the．Mother was my first teacher in my life．妈妈是我生命中的第一个老师．Tom is Lily's third boyfriend．汤姆是莉莉的第三个男朋友．
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