The correct passive voice form of the given sentence "Had they not cleared the exam ?" is Had the exam not been cleared by them?

The active voice of the sentence is "Had they not cleared the exam?" This sentence is in the past perfect tense, which is used to describe an action that happened in the past before another action happened. The passive voice of the sentence is formed by putting the subject of the active sentence after the verb "to be" and the past participle of the main verb. In this case, the subject of the active sentence is "exam" and the main verb is "clear." The past participle of "clear" is "cleared." So, the passive form of the sentence is "Had the exam not been cleared by them?"

The other options are incorrect because:

• Is the exam hot been cleared by them? This sentence is in the present tense, but the action of clearing the exam happened in the past.
• Have the exam not been cleared by them? This sentence is also in the present tense.
• Was the exam not been c learned by them? This sentence uses the wrong form of the past participle of the verb "clear." The correct form is "cleared."
• Had the exam not been cleared by them ? This sentence does not have a question mark.