নতুনদের বিসিএস প্রস্তুতি - ২০০ দিনে পুরো সিলেবাস১০৭টি পরীক্ষায় এসেছেপ্রশ্ন ২০Which one is correct?কHe had locked the door before he had gone to bed.খHe had locked the door before he had went to bed.গHe had locked the door before he goes to bed.ঘHe had locked the door before he went to bed.উত্তর দেখুন