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【单选题】
有以下程序 main() {char a1='M',a2='m'; printf("%c\n",(a1,a2)); } 以下叙述中正确的是 ______ 。
A.
程序输出大写字母 M
B.
程序输出小写字母 m
C.
格式说明符不足，编译出错
D.
程序运行时产生出错信息
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