题目内容
3．He has decided to have a party for his wife'sfortieth（forty） birthday．分析 他已决定为他妻子四十岁的生日开一个派对．
解答 答案：fortieth
根据所给词forty是基数词表达数量意为"四十"，再结合该空格前有名词所有格his wife's，后面修饰名词birthday作定语表达顺序，故用forty的序数词fortieth"第四十"，故填fortieth
点评 此题考查数词的用法，尤其是基数词和序数词的转化．做题时准确理解句意，抓住句中的关键词准确判断出所填数词的准确形式，并作出相应的形式上的变化
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