题目

自定义函数delStr(S，m)的功能是删除字符串S中第m位上的字符， Function delStr(S As String, m As Integer) As String Dim n As Integer n = Len(S) If m < 1 Or m > n Then delStr = ”输入位置有误！” ElseIf m = 1 Then delStr = Mid(S, 2, n - 1) ElseIf m < n Then                   ElseIf m = n Then delStr = Mid(S, 1, n - 1) End If End Function 则横线处代码填写正确的是(  ) A . delStr = Mid(S, 1, m) + Mid(S, m + 1, n) B . delStr = Mid(S, 1, m - 1) + Mid(S, m , n) C . delStr = Mid(S, 1, m) + Mid(S, m, n - m) D . delStr = Mid(S, 1, m - 1) + Mid(S, m + 1, n - m) 答案：D

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