A．启动Visual Basic时建立的窗体B．第一个添加的窗体C．最后一个添加的窗体D．在“工程属性”对话框-找考题网

A．Private Sub Command1_Click()
Dim B As Books
Open "c：\Person.txt" For Output As #1
B.Name=InpuBox(“输入姓名”)
B.TelNum=InputBox(“输入电话号码”)
Write #1，B.Name，B.TelNum
Close #1
End Sub
B．Private Sub Command1_ Click()
Dim B As Books
Open "c：\Person.txt" For Input As #1
B.Name=InputBox(“输入姓名”)
B.teLNum=InputBox(“输入电话号码”)
Ptint #1，B.Name，B.TelNum
Close #1
End Sub
C．Private Sub Command1_ Click()
Dim B As Books
Open "c：\Person.txt" For Output As #1
B.Name=InputBox(“输入姓名”)
B.TelNum=InputBox(“输入电话号码”)
Write #1，B
Close #1
End Sub
D．Private Sub Command1_ Click()
Dim B As Books
Open "c：\Person.txT" For Input As #1
Name=InputBox(“输入姓名”)
TelNum=InputBox(“输入电话号码”)
Print #1 Name. TelNum
Close #1
End Sub

当一个工程含有多个窗体时，其中的启动窗体是______。