Q
Change into passive voice: Who wrote this book?
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A
Who was written this book by?
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B
By whom was this book written?
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C
Who was this book written?
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D
By whom this book was written?
Correct Answer:
B. By whom was this book written?
Explanation:
'Who' (subject) becomes 'By whom' + was/were + subject + V3, keeping question order.