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单选题
Which Man class properly represents the relationship "Man has a best friend who is a Dog"?（）
A
class Man extends Dog { }
B
class Man implements Dog { }
C
class Man { private BestFriend dog; }
D
class Man { private Dog bestFriend; }
E
class Man { private Dog<bestFriend>; }
F
class Man { private BestFriend<dog>; }
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