We _ this problem for over two days.
Correct answer: D. Have been discussing
- A. Discuss
- B. Are discussing
- C. Discussed
- D. Have been discussing
Explanation
The correct answer is 'have been discussing' because it uses the present perfect continuous tense, which is appropriate for an action that started in the past and is still ongoing. The phrase 'for over two days' indicates a continuous activity over a period of time, making this tense the best choice. The other options either indicate a simple ongoing action, a completed past action, or do not specify the tense, which does not adequately capture the ongoing nature of the discussion over the specified time period.
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Tenses show when an action or state occurs and whether it is complete, continuing or repeated. The work covers present, past and future forms, including simple, continuous, perfect and perfect continuous constructions, as well as sequence of tenses and the difference between tense and aspect.
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