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题目
His little brother is ( ) a) five years old b)five-years-old c)five-year-old d) five-year-old

提问时间:2020-07-24

答案
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.
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