he is ______boy A.an eight years old B .an eight-year-old两个好像都行啊,奥不懂啊

he is ______boy A.an eight years old B .an eight-year-old两个好像都行啊,奥不懂啊
he is ______boy A.an eight years old B .an eight-year-old
两个好像都行啊,奥不懂啊

he is ______boy A.an eight years old B .an eight-year-old两个好像都行啊,奥不懂啊
B.
因为句末有boy这个词,eight-year-old 可做形容词.eight years old 不能做形容词.如果句子没有an 和boy,两者都可以.
不明白的再问哟,请及时采纳,多谢!

B 他是一个八岁的男孩，用连字符号就可以。

B
eight-year-old是复合形容词，就象：ten-year work, five-minute walk，用作定语修饰后面的名词boy
an eight-year-old boy = a boy of eight (years old)

B
他是个八岁的小男孩

B