单项选择题

单击命令按钮时,下列程序的执行结果是  Private Sub Book(x As Integer)    x=x * 2 + l    If x<6 Then      Call Book(x)    End If    X=X * 2 + 1    Print x;  End Sub  Private Sub Command2_Click()    Book2  End Sub

A.23 47
B.10 36
C.22 44
D.24 50