She <span>had been working</span> on the project for 2 days before she finished it. So B is the only right one as it's a continuous action before an action with an exact defining past perfect continuous. Also there's a key word "for" that can help us to find out the tense.
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Maybe they just lose interest in their original major
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May 03, 2017 · It should also be noted that many among the 70% who expect positive change in the next decade also expressed some of these concerns. There will be many millions more people and millions fewer jobs in the future. The problem of future jobs is not one of skills training – it is one of diminishing jobs.
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