33）下面程序的输出结果是 #include #include main() { char *p1="abc",*p2="ABC",str[50]= "xyz"; strcpy(str+2,strcat(p1,p2)); printf("%s\n",str);} (A)xyzabcABC (B)zabcABC (C)xyabcABC (D)yzabcABC