dialogue: M: Linda speaks English almost as well as an American. W: Don't you know her family lived in the U.S. until she was 12 years old? She's never forgotten her English.
question: What can we learn about Linda?
choice: She has been staying in the U.S. for 12 years. She went to America at the age of 12. She didn't leave the U.S. until she was 12.
answer: She didn't leave the U.S. until she was 12.