The National Green Tribunal (NGT).................( directs / has directed / has been directed ). The chief secretary to instruct officers in the district to assist the state power utility in......................... ( cleaning / cleans / having cleaned ) up a rever that................. ( was polluted / will have been polluted / had been polluted ) by fly ash. choose the correct alternatives.
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1. has been directed
2. cleaning
3. had been polluted
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