______ is a sequence of letters and digits, the first character must be a letter.

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问题 ______ is a sequence of letters and digits, the first character must be a letter.

选项 A、An identifier
B、A string
C、An array
D、program

答案A

解析 译文的含义是:(  )是字母和数字的组合,首字符必须是字母。选项A、B、C、D的含义分别是标识符、字符串、数组、程序。
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