The old man sitting opposite me cleared his throat as if________something.[      ]

A. said  

B. to say

C. having said  

D. saying

在窗体中添加一个名称为Command1的命令按钮，然后编写如下程序：
Public x As Integer
Private Sub Command1______Click()
x＝3
Call f1
Call f2
MsgBox x
End Sub
Private Sub f1()
x＝x*x
End Sub
Private Sub f2()
Dim x As Integer
x＝x+4
End Sub
窗体打开运行后，单击命令按钮，则消息框的输出结果为______。