— Are you pleased with the result of the football match?

— Sure. We have never had a            one.

A．good

B．better

C．bad

D．worse

对于下面定义的类MyClass，在函数f()中将对象成员n的值修改为50的语句应该是 ( )。class MyClass{public：MyClass(int X){n=x；}void SetNum(int nl){n=nl}private：int n；}int f(){MyClass*ptr=new MyClass(45)；______}

A．MyClass(50)
B．SetNum(50)
C．ptr-＞SetNum(50) D•ptr-＞n=50