Change active to passive voice. * who had invented pen
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By whom pen is being invented?
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Answer:
By whom had the pen been invented?
Explanation:
Active voice: When a subject is directly acting on the object, the sentence is written in Active voice.
Passive voice: When the object is acted upon by the subject, the sentence is written in Passive voice.
Wh sentences would always start with the question. Thus, who will change into by whom .
Due to *HAD* been will be added in the sentence.
Hence the answer will be...
By whom had the pen been invented?
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