১৪০ দিনে ৫১তম বিসিএস প্রস্তুতি৩২১টি পরীক্ষায় এসেছেপ্রশ্ন ২৩Identify the correct sentence.কThey playing music loudly while I tried to concentrate.খThey played music loudly while I was trying to concentrate.গThey playing music loudly while I was trying to concentrate.ঘThey have played music loudly while I was trying to concentrate.উত্তর দেখুন