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單項選擇題
下面那個代碼段正確的增加了一個TextBox控件到一個名為form1的Web窗體上？（）
A．TextBox c = new TextBox(); c.ID = "txtUserName"; c.Visible = true;
B．TextBox c = new TextBox(); c.ID = "txtUserName"; c.Visible = true; c.Controls.Add(form1);
C．TextBox c = new TextBox(); c.ID = "txtUserName"; c.Visible = true; c.Add(form1);
D．TextBox c = new TextBox(); c.ID = "txtUserName"; c.Visible = true; form1.Controls.Add(c);
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