单项选择题

阅读下面的程序:
Private Sub Form_Click()
Dim Check, Counter
Check=True
Counter=0
Do
Do While Counter < 20
Counter=Counter + 1
If Counter=10 Then
Check = False
Exit Do
End If
Loop
Loop Until Check = False
Print Counter, Check
End Sub
程序运行后,单击窗体,输出的结果为

A.15 0
B.20 -1
C.10 True
D.10 False