A. This book was already been read by millions of people around the world.
B. Millions of people around the world has already been read by this book.
C. This book has already read by millions of people around the world.
D. This book has already been read by millions of people around the world.
Feedback Sometimes we need to change a sentence from the Active Voice into the Passive Voice. We can also know a person who carries out the action. In this case we use the Passive Voice and form a sentence according to this rule: Subject - Be+ Past Participle - Preposition 'BY' - Agent (who or what carries out the action). In this sentence we use the Present Perfect Passive: has been read.