The door _ by him.
Correct answer: A. Was knocked at
- A. Was knocked at
- B. Was knocked
- C. Was knocking at
- D. Knocks at
Explanation
The verb "knock", when used with a door, requires the preposition "at". The passive form is "was knocked at".
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About Active and Passive Voice
Active voice presents the doer as the subject, while passive voice presents the receiver of the action and uses an appropriate form of “be” with the past participle. Questions cover tense changes, modal verbs, omitted agents and sentences that cannot be passivized because they lack a suitable object.
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