The passive voice is built by prefixing a form of the copula to the:
APast partial
BPast participle
CPast particular
DPast partition
Answer & Solution
Correct answer: B. Past participle
1. Is and was are forms of the copula.
2. One more part completes the verb-phrase.
3. It is the past participle.
_Source: Kittredge, An Advanced English Grammar with Exercises (Project Gutenberg)_
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