[单项选择题] 当Command1_Click事件发生时，窗体上显示的内容是 ______。 Private Sub Command1_Click() Dim a As Integer，b As

[单项选择题] 当Command1_Click事件发生时，窗体上显示的内容是 ______。

Private Sub Command1_Click()

Dim a As Integer，b As Integer，c As Integer

If a = 0 Then

x = x-1

Else

If b ＜＞ 0 Then

x = 7

Else

x=x+8

End If

If c ＜＞ 0 Then

x = x-3

Else

x = 4

End If

Print x

End Sub

A．7

B．8

C．4

D．3