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【单选题】
int N = 10;const int &M;M = 100;N = 100;有上述const的应用代码段，且有如下四种叙述A.M必须初始化，没有初始化是错误的B.M=100;是正确的，可以通过引用M修改N的值。C.N=100;是允许的。D.N=100;是不允许的。请指出有关该代码叙述的正确选项。A.
AC
B.
BD
C.
AB
D.
CD
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