45)有以下程序 #include structtt {intx;structtt*y;}*p; structtta[4]={20,a+1,15,a+2,30,a+3,17,a}; main) {inti; p=a; fori=1;i<=2;i++){printf"%d,",p->x);p=p->y;}}程序的运行结果是
(A)20,30,
(B)30,17
(C)15,30,
(D)20,15,

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