---Howoldisyourson?---________.Wehadaspecialpartyforhis________birthday

发布时间：2020-08-06 19:43:14

---How old is your son?---________.We had a special party for his ________ birthday last Sunday.A.Nine；ninthB.Nine；nineC.Ninth；nineD.Ninth；ninth

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A解析回答年龄要用基数词。他的第几个生日要用序数词。所以选项A符合要求。
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