Monasteries were cultural and educational centres, weren't they? - разделительный
Were monasteries cultural or educational centres? - альтернативный
Were monasteries cultural and educational centres? - общий
What was a cultural and an educational centre? - специальный ( вопрос к подлежащему)
What kind of centres were monasteries? - специальный( вопрос к именной части сказуемого)
What were monasteries?