在窗体上画一个名称为Command1的命令按钮和一个名称为List1的列表框。如下图所示程序的功能是：单击命令按钮后，程序用“筛选法”求出1-100之间的全部素数。并将素数在列表框中显示出来。根据题意，填空处应选择 Option Base 1 Dim a(100)As Integer Private Sub Command1_Click() n = 100 For i = 2 To Sqr(n) For j = i + 1 To n If j Mod i = 0 And a(j)＜＞ 0 Then a(j)= 0 Next j Next i For i = 1 To n If a(i)＜＞ 0# Then Next i End Sub Private Sub Form_Load () For i = 1 To 100 a (i)=i Next i End Sub
A．List1.Text=Str(a()+ vbCrLf
B．List1.Text=Str(a()+ vbCrLf
C．List1.AddItem a(
D．List1.AddItem=a(