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理论知识部分单选题中等

在C语言中,下列哪个多重选择结构是不合法的?

Aif(a) printf("Yes"); else if(b) printf("No");
Bif(a) printf("Yes"); else if(b) printf("No"); else printf("Maybe");
Cif(a) printf("Yes"); else if(b) printf("No"); else if(c) printf("Maybe");
Dif(a) printf("Yes"); else if(b) printf("No"); else if(c) printf("Maybe"); else printf("Unknown");