1 . 'I know that he did the work'- বাক্যটির সঠিক পরিবর্তিত voice হবে -

• A. It was known to me that the work was done by him.
• B. It is known to me that the work was done by him
• C. It was known to me that the work has been done by him.
• D. It was known to me that the work had been done by him

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Answer: Option B

Explanation: