Jane is high school student.A. an 16-year-oldB. a 16-years-oldC. a 16 years oldD. a 16-yea

问题补充：

Jane is high school student.

A. an 16-year-old

B. a 16-years-old

C. a 16 years old

D. a 16-year-old

答案：

A. an 16-year-old

B. a 16-years-old

C. a 16 years old

(答案→)D. a 16-year-old

解析：句意：简是一个16岁的高中生。加连字符构成的形容词结构为16-year-old，中间的名词必须用单数形式，A项冠词使用错误；故选D。