问题
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;
B:Twenty-first, twenty-first
C:Twenty-one, twenty-one
D:Twenty-first, twenty-one;
正确答案是：
