Question

【题目】—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

Answer 1

【答案】A
【解析】句意：—你妹妹多大了？—21岁，我们昨天为她第二十一个生日开了一个特别的派对。表示年龄时使用基数词的形式，在多少岁生日前用序数词，所以答案是A。