Change the following from active to passive: Policy experts have been questioning the new proposal for its vague provisions and weak enforcement.

Explanation

The correct option is (a). The active sentence is: “Policy experts have been questioning the new proposal ...” The tense here is Present Perfect Continuous (have/has been + V1-ing). To convert active to passive, we move the object “the new proposal” to the subject position, keep the tense equivalent, and add “by + agent” when needed. Structure: Active voice: Subject + have/has been + V1-ing + Object Passive voice: Object + have/has been being + V3 + by + Subject Therefore, the correct passive form is: “The new proposal has been being questioned ... by policy experts.” Option (a) matches this required structure and retains the complete meaning, including the continuous sense of an ongoing activity. Why other options are incorrect: Option (b): Changes tense to Simple Past and also shortens meaning. Copyright Option (c): Changes the meaning by dropping “vague © 2026 provisions” andAdda247 does not keep the continuous aspect. Option (d): Uses Present Continuous Passive (“is being questioned”), not Present Perfect Continuous Passive. Booster note: Although “has been being” can sound heavy in modern usage, it is the grammatically correct passive equivalent tested in competitive exams. So the correct answer is (a)