His little brother is ( ) a) five years old b)five-years-old c)five-year-old d) five-year-old
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选A five years old
five-year-old=five years old
前者是附和名词作定语修饰另一个名词 例如：he has a five-year-old son.
后者是系表结构里的表语 例如：his son is five years old.
希望能帮到你！~
five-year-old=five years old
前者是附和名词作定语修饰另一个名词 例如：he has a five-year-old son.
后者是系表结构里的表语 例如：his son is five years old.
希望能帮到你！~
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A
five-year-old 只能放在名词前作定语，“五岁大的”。不能放be动词后作表语。而且有连词符时，year必须用单数。
即 His little brother is five years old. = His little brother is a five-year-old boy.
five-year-old 只能放在名词前作定语，“五岁大的”。不能放be动词后作表语。而且有连词符时，year必须用单数。
即 His little brother is five years old. = His little brother is a five-year-old boy.
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