问题
选择题
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
题目分析：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。