A:to catch
B:caught
C:catching
D:to be catching
程序代码
Private Sub Command1_Click()
Dim i As Integer
Dim s As Long
s = 1
For ①
②
Next i
Label1.Caption = ③
End Sub
程序运行结束i的值为: ④
划线处①应填入____
划线处②应填入____
划线处③应填入____
划线处④应填入____