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【单选题】
C++语言做了很多改进，下列描述中 _______ 使得C语言发生了质变，即从面向过程变成面向对象。A.
增加了一些新的运算符
B.
允许函数重载，并允许设置默认参数
C.
规定函数说明必须用原型
D.
引进类和对象的概念
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