[单选题]在以下关于C/C++语言的叙述中，正确的是（）

A、if语句结构中必须有else语句
B、switch语句结构中必须有default语句
C、C程序必须有return语句
D、C中使用输入输出函数完成输入输出操作。

参考答案： D

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