Which of the following options is the most suitable conversion of the following sentence into Passive Voice?
The engineers completed the structural analysis before the design phase began.
Show answer & explanation
Correct answer: D
Explanation
The original sentence, "The engineers completed the structural analysis before the design phase began," is in the active voice and uses the simple past tense ("completed") for its main clause. The passive voice conversion requires the past tense of the verb "to be" ("was") followed by the past participle of the main verb ("completed").
Option D correctly uses the simple past passive voice "was completed".