i = 1: j = 9: flag = False
Key = Val(Text1.Text)
Do While i < j
m = (i + j + 1) \ 2
If a(m) > Key Then j = m - 1 Else i = m + 1
If a(m) = Key Or a(m + 1) = Key Then flag = True: Exit Do
Loop
If flag Then
If a(m) = Key Then Text2.Text = Str(m) Else Text2.Text = Str(m + 1)
Else
Text2.Text = "找不到"
End If
程序运行时，数组元素a(1)到a(9)中的数据为12,24,27,34,39,46,68,73,84，在文本框Text1中输入“68”，执行该程序段，则下列表达式正确的是（ ）
