【单选题】【消耗次数：1】
实现运行时的多态性要使用（）
①
构造函数
②
析构函数
③
重载函数
④
虚函数
参考答案：
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（）不是析构函数的特征。
①
一个类中只能定义一个析构函数
②
析构函数名与类名相同
③
析构函数只是用来释放对象，所以析构函数是空函数
④
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④
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businesses employed
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businesses had employed?
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had businesses employed
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having lost
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losing
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evenhotter
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used to;is used to
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used to;is used for
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Walking or sleeping
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Walking or slept
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Having walked or slept
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To walk and sleep
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who
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