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The professor of Environmental Science had ahmed ____ a research on global warming and said that is was imperative that he a report on solid waste  management by following Tuesday.Appropriate fillers for the blanks are.

A. do , write
B. was , hadn't
C. had been , wouldn't have
D. done , should have written
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সঠিক উত্তরঃ A. do , write
Explanation: