সঠিক উত্তরঃA.
I not only went to the book fair but also bought a number of books.
Explanation: • Simple sentence এ “besides + verb + ing থাকলে compound sentence এ “not only..….but also” structure ব্যবহার করে compound sentence টি গঠন করতে হয়। - সুতরাং সঠিক বাক্যটি হবে - I not only went to the book fair but also bought a number of books.
