Who has done this voice change
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Question :
Who has done this ?
( Change the voice )
Answer :
By whom has this been done ?
Rules :
Here, 'who' changes into 'By whom' in passive voice.
The sentence is in present perfect tense. Here, 'has' changes into 'have been' and the sentence being interrogative one, it takes a new form as seen in the answer.
#_100% correct✌
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