Bill is an _______ boy.
A．eight years oldB．eight-years-old
C．eight-year-oldD．eight-year-olds
C
表示多少歲數(shù)修飾名詞，可用兩字符將每個單詞連在一起，不可使用復數(shù)形式，相當于一個形容詞，故本題選C。
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