If the control is set to single-selection mode, this property returns the one selected item.
如果将控件设置为单选模式，则此属性将返回一个选定的项。
Because the edit field of the combo box shows the current selection, the combo box is by nature a single-selection control.
因为组合框的编辑字段显示当前选择，所以组合框本质上是单一选择控件。
Because the edit field of the combo box shows the current selection, the combo box is by nature a single-selection control.
因为组合框的编辑字段显示当前选择，所以组合框本质上是单一选择控件。
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