How to add multiple Choice field in Django Model Form

 class MODEL(models.Model):

    MY_CHOICES = (
        ('a', 'Hola'),
        ('b', 'Hello'),
        ('c', 'Bonjour'),
        ('d', 'Boas'),
    )
    ...
    ...
    my_field = models.CharField(max_length=1, choices=MY_CHOICES)
    ...