Monty never shows the car. That was stated in the original reply from Marilyn, and it should be obvious to anyone who's watched a game show. Why on earth would

Monty never shows the car. That was stated in the original reply from Marilyn, and it should be obvious to anyone who's watched a game show. Why on earth would monty open a door, show you the prize (which you now can't get) and then ask you if you want to switch your door? No one would design a game show like that, so it means the question only has sense if interpreted as "Monty always opens a goat door".