【題目】—How old is your sister?
— .We had a special party for her birthday yesterday.
A.Twenty-one, twenty-first
B.Twenty-first, twenty-first
C.Twenty-one, twenty-one
D.Twenty-first, twenty-one

【答案】A
【解析】句意：—你妹妹多大了？—21歲，我們昨天為她第二十一個生日開了一個特別的派對。表示年齡時使用基數(shù)詞的形式，在多少歲生日前用序數(shù)詞，所以答案是A。

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