Question

Has that rose bush been pruned?(change the voice)

Answer 1

The voice of Present Perfect Continuous Tenses cannot be changed. So It is not possible to change the voice of this sentence

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Answer 2

The given sentence is in passive voice and the agent (i.e. the doer of the action) is not mentioned. So we introduce a doer of the action of pruning the rose bush- 'They' So the active voice becomes-
Have they pruned that rosh bush?
While converting into active the tense should remain the same always.