16. 请输入B的值在窗体上画一个命令按钮,然后编写如下事件过程:
Private Sub Command1_Click( )
x = 0
Do Until x = -1
a = InputBox("请输入A的值" )
a = Val(a )
b = InputBox("请输入B的值" )
b = Val(b )
x = InputBox("请输入x的值" )
x = Val(x )
A. 2
B. 3
C. 15
D. 14
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