单项选择题：下列四组选项中，正确的C语言标识符是（）。 A.%x B.a+b C.a123 D.

题型：问答题

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下列四组选项中，正确的C语言标识符是（）。 A.%x B.a+b C.a123 D.

题目：

答案：