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I have submitted a paper to IEEE transactions on knowledge and data engineering (TKDE). Until now, it has been 7 months and the status of my paper is still "Under Review". It has stayed in the same status from the first day of the submission. I have sent an email to the admin of the journal, and she replied to me that the paper was being processed. I have waited more than 1 month without any update.
Has anyone experienced the same situation? What should I do? Many thanks.