打开Exlce，
确定，然后
右击查看代码，把这段代码复制到新建的文件里面
此时Excel会给出提示，选择否，，系统会提示保存，在保存的时候选择启用宏的工作簿然后保存，此时Excel下拉框多选就搞定了，最后，代码如下：
Option Explicit
Sub Worksheet_Change(ByVal Target As Range)
'让数据有效性选择 可以多选,重复选
Dim rngDV As Range
Dim oldVal As String
Dim newVal As String
If Target.Count > 1 Then GoTo exitHandler
On Error Resume Next
Set rngDV = Cells.SpecialCells(xlCellTypeAllValidation)
On Error GoTo exitHandler
If rngDV Is Nothing Then GoTo exitHandler
If Intersect(Target, rngDV) Is Nothing Then
'do nothing
Else
Application.EnableEvents = False
newVal = Target.Value
Application.Undo
oldVal = Target.Value
Target.Value = newVal
If oldVal = "" Then
Else
If newVal = "" Then
Else
Target.Value = oldVal _
& ", " & newVal
End If
End If
End If
exitHandler:
Application.EnableEvents = True
End Sub
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