The architectural team ______ on the blueprint for six months before the municipal permit was finally approved.
Answer and explanation
Correct answer: B. had been working
- Step 1: Analyze past duration: The working occurred continuously over a 6-month period prior to another past event ('was finally approved').
- Step 2: An ongoing action prior to a completed past event requires the past perfect continuous tense: 'had been working'.
Answer
had been working.
Why not the others: 'has worked' is present perfect which connects to the present; 'works' is simple present; 'will have worked' is future perfect.
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