The ___man is my farther.A.fifty -one years oldB.fifty -one -year -old答案选择B,但为什么A不能选?

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The ___man is my farther.
A.fifty -one years old
B.fifty -one -year -old
答案选择B,但为什么A不能选?

答案选择B. fifty -one years old(名词)表示51岁; fifty -one -year -old (形容词)表示51岁的; The fifty -one -year -old man表示51岁的人, fifty -one -year -old在本句子中作形容词.