IMO: For a week now , I am trying to solve a/this mathematic al problem. For a week now , I have been trying to solve a/this mathematic al problem. I'd say the 2nd is the most appropriate one, as the present perfect is the most fit for such a situation, but the first would be also acceptable.
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Marius HancuIMO:
For a week now, I am trying to solve a/this mathematical problem.
For a week now, I have been trying to solve a/this mathematical problem.
I'd say the 2nd is the most appropriate one, as t