Not until ___ to do my homework ____ how much time I had wasted playing computer games.   [ ]

A. I began; I realized      

B. I began; did I realize    

C. did I begin; I realized    

D. did I begin; did I realize

企业经营的直接目的是

A．获取利润

B．社会效益

C．承担社会责任

D．向社会提供更好的商品和服务