英语短文改错 The Milu deer used to be common in China long before.As other deer theylived together and eat grass and soft parts of trees such as small branch.问:long before 里面的before 为什么 要变成ago .as 为什么变成like?

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英语短文改错 The Milu deer used to be common in China long before.As other deer they
lived together and eat grass and soft parts of trees such as small branch.
问:long before 里面的before 为什么 要变成ago .as 为什么变成like?