" I didn't know that reading this book was important for our exam, I didn't read it." Identify the correct combination -
A. If I knew this book was important, I had read it.
B. If I would have known this book was important, I had read it.
C. If I had known this book was important , I would have read it
সঠিক উত্তরঃ
B.
If I would have known this book was important, I had read it.
Explanation: 
