单选题：从字符串s中的第2个字符开始获得4个字符的子字符串函数是（　　）。【考点3 VBA程序设计基础】

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从字符串s中的第2个字符开始获得4个字符的子字符串函数是（　　）。【考点3 VBA程序设计基础】 A．Mid$(s，2，4)
B．Lefl$(s，2，4)
C．Right(s，4)
D．Left$(s，4)

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