Hello, everybody. Question ---> When must we use when + had V3 , V2 instead of when + V2, had V3 (Please the person who knows the answer of this question answer this.)
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Explanation:
Renewable energies. Changing our main energy sources to clean and renewable energy. ...
Sustainable transportation. ...
Air pollution prevention. ...
Waste Management & recycling. ...
Sea and Ocean preservation. ...
Circular economy.
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