[单选题]假定一个类的构造函数为 “A(int aa, int bb) {a=aa; b=aa*bb;}”,则执行 “A x(4,5);”语句后,x.a和x.b的值分别为( )。

A、4和5
B、5和4
C、4和20
D、20和5

参考答案： C

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