Task: Question Answering
Input (English): Passage: My friend Stacy and myself wanted to go shopping downtown . The fastest way to get there was to take the underground . I looked up the schedule to see what time we would need to be there for the underground to the city . We made sure to have enough money to pay for the underground before we got there . Once there , we waited patiently for a few minutes . We wanted to get there a little bit early just in case there were any mishaps on the way there . Once the underground pulled up , we paid our fees and found a seat to sit on for the trip . We made sure to stay together and got off at the same time so we would not get lost in the crowds . Question: When did they get on the underground? Option1: when they underground pulled up Option2: immediately
Output (English): when they underground pulled up