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Complete the following sentences as in the model using the Past Perfect Continuous Tense:
Example: He had been studying microeconomics for 2 years ... .
He had been studying microeconomics for 2 years before he
passed the exam (by that time, etc.).
1. They had been quoting prices on these goods for an hour ... .

2. This company had been lowering stocks in value for 2 hours ... .

3. They had been discussing current prices for 20 minutes ... .

4. We had been talking about the aggregate output for half on hour ... .

5. They had been establishing price index for an hour ...
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