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Практическая грамматика
Choose the appropriate choice which correctly converts the given affirmative sentence into negative sentence. I have been working on the project since 2015. (Positive) I have not been ... on the project since 2015. (Negative)

Choose the appropriate choice which correctly converts the given affirmative sentence into negative sentence. I have been working on the project since 2015. (Positive) I have not been ... on the project since 2015. (Negative)