The northbound train was waiting at Central Station, and we needed to board it. Complete with the correct phrasal verb based on get, using it to refer to the train: We managed to ___ just before the doors closed.
Correct answer
get on it
Explanation
Getting on a train means boarding it, which is the action described before the doors close. The pronoun follows the intact, inseparable expression; putting it between got and on would be ungrammatical.