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1)I am writing in connection with the advertisement which appeared/has appeared on 3 December.
2)I originally studied/have studied mechanical engineering at university and I graduated/have been graduating with a first-class degree.
3)I now completed/have now completed a postgraduate degree in business and administration.

1) has appeared2) studied; graduated3) have now comletedМогут быть ошибки, ибо года два тему не повторял