i = 1: j = 7: x = 55

Do While i <= j

     m = (i + j) \ 2

     If a(m) = x Then Exit Do

     If a(m) > x Then j = m - 1 Else i = m + 1

Loop

经过上述代码查找后，下列表达式正确的是(   )

程序界面如图所示：

Private Sub Command1_Click()

 Dim a(1 To 8) As Integer

 Dim n, i, j, x As Integer

 List1.Clear

 List2.Clear

 a(1) = -5: a(2) = 3: a(3) = 4: a(4) = 12: a(5) = 20: a(6) = 45: a(7) = 70

 For j = 1 To 7

  List1.AddItem Str(a(j))

 Next j

 x = Val(Text1.Text)

 i = 1

 Do While x > a(i) And i < 8 ’找x的插入位置

  ① 

 Loop

 For j = 8 To i + 1 Step -1 ’移动数据

  ② 

 Next j

 a(i) = x

 For j = 1 To 8

  List2.AddItem Str(a(j))

 Next j

 Label1.Caption = “插入的位置是” &Str(i)

End Sub

a(1) = 11 : a(2) = 14 : a(3) = 23 : a(4) = 23 : a(5) = 30 : a(6) = 42

key = Val(Text1.Text)

L = 1 : R = 6 : x = 0

Randomize

Do while L <= R

    mid = Int(Rnd() * (R-L+1))+ L

    If a(mid) = key Then

        Exit Do

    ElseIf a(mid) > key Then

        R = mid - 1

        x = x - 1

    Else

        L = mid + 1

        x = x + 1

    End If

Loop

If L <= R Then

    Label1.Caption = "查找成功，" + "位置为" + str(mid)

Else

    Label1.Caption = "查找失败"

End If

该程序执行后，在文本框Text1中输入23，则x的值不可能是（  ）