问题描述：
He tried to look younger than he is but his gray hair gives him ____.
A.in B.out C.up D.away
请高手给个确切的答案,讲下其中的语法知识,再翻译下这句话,
A.in B.out C.up D.away
请高手给个确切的答案,讲下其中的语法知识,再翻译下这句话,
问题解答：
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