What change should be made to sentence 3?

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Read the selection and answer the questions that follow: . (1) The Freedom Trail is in Boston, Massachusetts and it's a two and a half mile path through the center of Boston that takes you past buildings and places that were important in Boston's history and in Revolutionary War history. (2) The trail begins on the Boston Common, which is a big park with baseball fields and large grassy stretches. (3) Back in 1634 when it was first established, the Boston Common was usually used to keep livestock like cows. (4) Later, it was a place where soldiers camped out when they passed through the... Show more

What change should be made to sentence 3?