问题补充：
Our English teacher hasson.
A. a 8-year-old
B. an 8-years old.
C. a 8-year-old
D. an 8-year-old
答案：
A. a 8-year-old
B. an 8-years old.
C. a 8-year-old
(答案→)D. an 8-year-old
解析：句意：我们英语老师有个八岁的儿子。8-year-old八岁大的，放在名词前面做定语，有连字符时year不用复数形式，eight的读音以元音开头，前面用冠词an，故选D。
