Multiple choice

He complained of _________ by the police.

  1. having been tortured

  2. tortured

  3. torturing

  4. having tortured
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A Correct answer
Explanation

After prepositions like 'of', we use gerund forms. Since the torture happened before the complaint, we need the perfect gerund 'having been tortured'. The passive voice is essential because he was the recipient of the action, not the doer. 'Tortured' is a past participle, 'torturing' is active voice, and 'having tortured' is active perfect gerund.

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