设有以下程序代码：Private Sub Command1_Click() Dim x As String, y As Integer x = "考试" y = 1 proc x, y Print "第"; y; "次"; xEnd SubSub proc(ByVal a As String, b As Integer) a = "参加" + a b = b + 1End Sub运行程序，单击命令按钮后显示的是

单项选择题在窗体上有4个文本框，名称分别为Text1、Text2、Text3、Text4，和1个名称为Command1的命令按钮，然后编写如下程序代码：Private Sub Command1_Click()Dim year%, month%, days%year = Val(Text1)month = Val(Text3)For k = 1 To month - 1Select Case kCase 1, 3, 5, 7, 8, 10:days = days + 1Case 4, 6, 9, 11:days = days + 30Case 2:days = days +______________End SelectNext kText4 = daysEnd SubFunction LeapYear(x As Integer) As IntegerIf x Mod 400 = 0 Or x Mod 4 = 0 And x Mod 100

单项选择题编写如下程序：Private Sub Command1_Click() Dim a$, b$, c$, c1$, c2$ a = InputBox( 请输入一个字符串 ) b = InputBox( 再输入另一个字符串 ) c = For k = 1 To IIf(Len(a) < Len(b), Len(b), Len(a)) c1 = IIf(k <= Len(a), Mid(a, k, 1), ) c2 = IIf(k <= Len(b), Mid(b, k, 1), ) c = c & c1 & c2 Next k Print cEnd Sub程序运行后，单击命令按钮Command1，然后从键盘依次输入字符串： 12345678 、 ABCDE ，则输出结果是