The official language is Moroccan Arabic which is quite different from the Arabic of the Middle East. French is the second language of the country with Berber spoken by the Berber peoples especially in the south. The Moroccans seem to have a finely tuned ear and can mimic the speech of almost anyone. In Tangier, almost of people do speak Spanish. Those who come into contact with tourists have taught themselves to converse in all the major languages. You will be humbled by their abilities especially if you have taken a language course and still can't carry on a conversation in anything other than your mother tongue. To put it plainer, you really don't need to speak French or Arabic, but there will be times when life would be much easier if you knew a few words. Bring a French or Moroccan Arabic phrase book.