Tom is boy now.
A. a 11-years-old
B. a 11-year-old
C. an 11-year-old
D. an 11-years-old
网友回答
A. a 11-years-old
B. a 11-year-old
(答案→)C. an 11-year-old
D. an 11-years-old
解析：英语中两个或多个单词中间可以用短横线连接起来，起一个相当于形容词的作用，这类单词叫做合成词。其一般构成规则就是其构成单词一般都要用原形。句意:汤姆现在是一个十一岁的男孩了。Eleven词首音素是元音，故不定冠词用an，选C。