he is reading a book用i didn't know,变宾语从句

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he is reading a book用i didn't know,变宾语从句
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he is reading a book用i didn't know,变宾语从句
he is reading a book用i didn't know,变宾语从句

he is reading a book用i didn't know,变宾语从句
i didn't know that he was reading a book

I didn't know whether he was reading a book.