English Language · English
Convert the sentence from passive to active: Rare minerals are known to have been secretly extracted from the site by unauthorized workers before the inspection.
- 1Unauthorized workers have been known to have secretly took rare minerals before the inspection.
- 2Unauthorized workers had been known to have secretly taken rare minerals before the inspection.
- 3Unauthorized workers are known to have secretly extracted rare minerals from the site before the inspection.✓
- 4Unauthorized workers were known to have secretly take rare minerals before the inspection.
Correct answer
Unauthorized workers are known to have secretly extracted rare minerals from the site before the inspection.
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