Li ping’s brother is an boy.
A. eighteen-years-old
B. eighteen years old
C. eighteen-year-old
D. eighteen year old
网友回答
A. eighteen-years-old
B. eighteen years old
(答案→)C. eighteen-year-old
D. eighteen year old
解析：此题重点考查合成形容词的基本构成；英语中几个单词之间用短横线连接起来，可以起一个类似于形容词的作用，注意每个单词都要用原形，因8的第一个音素是元音音素，故不定冠词用an.