下列VB程序段的功能为：生成n个不重复的随机整数，保存在数组a中，并升序排序。 Const n = 6
Dim a(1 To n) As Integer, f(1 To 10) As Boolean
Dim tmp As Integer, i As Integer, j As Integer, t As Integer
‘f数组各元素的初值置为False，代码略
For i = 1 To ⑴
t = Int(1 + Rnd * 10)
If Not f(t) Then
a(i) = t : f(t) = True
For j = ⑵
If a(j) < a(j - 1) Then
tmp = a(j): a(j) = a(j - 1): a(j - 1) = tmp
End If
Next j
Else
⑶
End If
Next i
上述程序段3个方框处的表达式分别为( )
