如何在excel VBA中以表格的形式向combobox中添加项目?

I am new to VBA. I want to create a form where a user selects an item of a combobox and the selection runs a macro.I created a user form in VBA but I am unable to add items to the Combobox.When a user opens the form I want the choices in the combobox to be already loaded.how can I accomplish this?I am new to VBA. I want to create a form where