如何调用base.base.GetHashCode（）等二级基类方法

class A
{
    public override int GetHashCode()
    {
        return 1;
    }
}
class B : A
{
    public override int GetHashCode()
    {
        return ((object)this).GetHashCode();
    }
}

new B().GetHashCode()
class A
{
    public override int GetHashCode()