问题补充:
Jane is high school student in the United States.
A. an 18-year-old
B. a 18-years-old
C. an 18-years-old
D. a 18-year-old
答案:
(答案→)A. an 18-year-old
B. a 18-years-old
C. an 18-years-old
D. a 18-year-old
解析:句意:Jane是一个18岁的美国高中生。18-year-old 18岁,做定语,修饰后面的名词,注意有连字符时year不用复数;单词eighteen读音以元音开头,所以前面用冠词an,故选A。