在窗体中有一个标签Lbl和一个命令按钮Commandl，事件代码如下： Option Compare Database Dim a As String*10 Pfivae Sub Commandl_Click()a＝“1234”b＝Len(a)Me.Lbl.Caption＝b End Sub 打开窗体后单击命令按钮，窗体中显示的内容是( )。

A．4

B．5

C．10

D．40

It was not until she had arrived home ______ her appointment with the doctor. [ ]

A. did she remember

B. that she remembered

C. when she remembered

D. had she remembered