Developing countries do not need to damage their environment as they developed their economy.
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Your sentence is incorrect. Here are the correct versions. I think the writer meant the present tense.
Present tense: Developing countries do not need to damage their environment as they develop their economy.
Past tense: Developing countries need not have damaged their environment as they developed their economy.
Past tense: Developing countries didn
What does the immigration restriction marked a political victory for Progressive-Era race-nativism as well as the isolationism of the interwar period?