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1 vote
She ______ on the project for 2 days before she finished it.

Answers A - has worked
B - had been working
C - is working
D - was working

User Kpg
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1 Answer

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She had been working 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.
User Xslittlegrass
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