পেট্রোবাংলা প্রিলি ও লিখিত সমন্বিত প্রস্তুতি [Archived]১টি পরীক্ষায় এসেছেপ্রশ্ন ২০When he was 16, he started his own business. (Make it simple) কAt 16 he started his own business.খAt the age of 16, he started his own business.গAs his age was16, he start his own business.ঘHe was at 16, when he start his own business.ঙAt the time of 16, he started his own business.উত্তর দেখুন