问题
Mike, why did you copy Lisa’s homework again—Sorry, Miss Smith, I ____ do it again.
A:a seven-years-old
B:an eighth-year-old
C:a seven-year-old
D:an eight-years- old;
B:an eighth-year-old
C:a seven-year-old
D:an eight-years- old;
正确答案是：
