She had been leading us for years, But she moved away.
Explanation:
As mentioned, We must use Past perfect progressive form to complete the above given statement.
Past prefect progressive Tense:
Past perfect progressive tense is also known as Past perfect continuous tense.
This tense generally denotes the action that might have started at any time in the past and could have continued to until some period of time in the past.
This tense can be formed by adding Had or Has been in front of the verb and converting the verb into it's present particle.
By considering this, we can choose Had been leading as the correct answer.
And the sentence can be ended as "She had been leading us for years,But she moved away.
