They are ( ) students.A.thirteen years old B.thirteen-year o

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They are ( ) students.A.thirteen years old B.thirteen-year old
C.thirteen-year-old D.thirteen-years-old
求讲解部分.几个单词中的-有没有有什么区别.
year 在什么情况下加S

C
thirteen-year-old,用短横连接变成一个单词,而且是形容词,通常作定语,修饰名词,再如：an eight-year-old boy 一个八岁的男孩
thirteen years old,三个单词,通常在be动词后作表语,如：He is thirteen years old.

They are ( ) students.A.thirteen years old B.thirteen-year o thirteen years old 与 thirteen -year-old的区别 thirteen years old与thirteen-year-old的区别 tom is a___boy.A.thirteen years old B.thirteen-years-old C.t I this year thirteen years old tonight we are __to a thirteen-year-old boy. We are thirteen years old 反义疑问句 a thirteen-year-old boy=什么? a thirteen-year-old boy的中文翻译适当形式：You __were__(be) thirteen years old last year. My sister is thirteen years old.(提问thirteen years old) We are talking to Alan,a thirteen-year-old boy.对Alan,a thirt