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【单选题】
假设已经定义好了类student,现在要定义类derived,它是从student私有派生的,则定义类derived的正确写法是A.
class derived ：student private{ //………….}
B.
class derived ：student public { //………….}
C.
class derived ：public student { //………….}
D.
class derived ：student{ //………….}
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