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【单选题】
下列关于虚基类初始化的说法中,正确的是()。A.
虚基类的初始化可由它的各层派生类构造函数引起,故不止一次初始化
B.
虚基类的直接派生类构造函数的初始化列表中可以不包含虚基类的构造函数
C.
无论是否定义最后派生类的对象,虚基类的构造函数一定至少调用一次
D.
在最后派生类构造函数的调用中,先调用虚基类的构造函数,在调用其他基类的 构造函数时不再对虚基类进行初始化
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