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【单选题】
设在窗体上有一个文本框，然后编写如下的事件过程： Private Sub Text1_KeyDown(KeyCode As Integer, Shift As Intcger) Const Alt=4 Const Key_f2=&H71 altdown%=(Shift And Alt) ＞ 0 f2down% And f2down% Then If altdown% And f2down% Then Text ='abl' End If Ead Sub 程序运行后，清除文本框中原有内容，如果按Shift+F2键，则在文本框中显示的是A.
Alt+F2
B.
abl
C.
随机出儿个数
D.
不发生变化
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