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编写一个VB程序，实现如下功能：在文本框text1中输入英文句子，单击“第1个最长单词”按钮，找到第1个最长单词并显示在文本框text2中。运行效果如图所示

为实现上述功能，请在画线处填入合适代码
Private Sub Command1_Click()
Dim s As String, m As String
Dim n As Integer, c As Integer, max As Integer, t As Integer
s = Text1.Text
n = Len(s)
c = 0
max = 0
For i =" 1" To n
m =        ①     ‘截取字符串中的每个字符
If m >= "a" And m <= "z" Or m >= "A" And m <= "Z" Then
c =" c" + 1
Else
If c > max Then
max = c
t=" i" - 1
End If
c = 0
End If
If i =" n" Then
If c > max Then
max = c
t = i
End If
End If
Next i
Text2.Text = Mid(s,      ②      , max)
End Sub
（1）程序中①处填入的代码是：         
（2）程序中②处填入的代码是下列哪个选项（）

A．t

B．t-max

C．t-max+1

D．t-max-1