问题
Is Mary ? —No, she is a girl.
A:twelve years old; fourteen years old.
B:twelve years old; fourteen -year -old.
C:twelve - year - old; fourteen years old.
D:twelve - year - old; fourteen - year -old.
B:twelve years old; fourteen -year -old.
C:twelve - year - old; fourteen years old.
D:twelve - year - old; fourteen - year -old.
正确答案是：
