Question

How had thy completed the work ? (change the voice)​

Answer 1

Answer:

how was the work completed by them?

Explanation:

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Answer 2

Answer:

Active voice: How had they completed the work?

Here, the subject is "they" and the the object is "(the) work". The verb is "completed". Since, the passive voice takes a form of the auxiliary verb "be" + past participle of the main verb, followed by the subject, and because the verb is already in it's past participle form:

Passive voice: How had the work been completed by them?

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