1. (2020·浙江模拟) 有如下VB程序段：

Dim n As Integer, L As Integer, R As Integer, sum As Long, i As Integer

List1. Clear

n= Int（Rnd*3+11）*2+1

L=1：sum= 0

For R=1 To n\2+1

  Sum = sum+ R

  Do While sum > n

    Sum = sum - L

    L=L+1

  Loop

  If sum = n Then

   List1. AddItem Str（L） +””+ Str（R）

    Exit For

  End If

Next R

执行该程序段后，列表框List1中的值不可能为(    )