—How old is Mary?
— . We had a special party for her birthday yesterday.
A. Twenty; twentyth B. Twenty; twentieth C. Twenties; twentieth
—How old is Mary?
— . We had a special party for her birthday yesterday.
A. Twenty; twentyth B. Twenty; twentieth C. Twenties; twentieth
B。考查数词用法。表示年龄多少岁用基数词; 20岁生日用序数词twentieth, 故选B。