Answer and explanation

Correct answer: D. Parliamentarians vigorously debated the controversial treaty principles bill.

  1. Step 1: In the active voice, the grammatical subject ('Parliamentarians') performs the action of the verb ('debated') directly upon the object ('the bill'). Step 2. In the passive voice, the grammatical subject receives the action (e.g., 'The bill was debated'). Answer: Parliamentarians vigorously debated the controversial treaty principles bill. Why not the others: Options A, C, and D are passive constructions featuring auxiliary forms of 'to be' plus past participles.

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