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

অপশনসমূহ
সঠিক উত্তর চিহ্নিত
ক It was known to me that the work had been done by him
খ It was known to me that the work has been done by him
গ It is known to me that the work was done by him
ঘ It was known to me that the work was done by him
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