১৪০ দিনে ৫১তম বিসিএস প্রস্তুতি৪১৯টি পরীক্ষায় এসেছেপ্রশ্ন ৩৫Choose the correct sentence.কHe had finished his work before his friends had arrived.খHe had finished his work before his friends arrived. গHe had finished his work before his friends arrives. ঘHe had finished his work before his friends have arrived. উত্তর দেখুন