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【单选题】
下列关于标识符的说法中错误的是?A.
标识符以大写字母、小写字母或下划线开始。
B.
标识符可以由大写字母、小写字母、下划线和数字（0~9）组成。
C.
大写字母和小写字母代表相同的标识符。
D.
标识符不能是C++的关键字。
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皮皮学刷刷变学霸
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