1. 有如下VB程序段：

Dim i As Integer, j As Integer, st As String

n = 5

For i = 1 To 5

    st = “ ”

    If i < 4 Then

        For j = 1 To i

            st = st + “*”

        Next j

    Else

        For j = i To n

            st = st + “*”

        Next j

    End If

    List1.AddItem st

Next i

该程序段运行后，在列表框List1中显示的内容是(  )

A . B . C . D .