Computers will flourish because they enable us to accomplish tasks that could never before have been undertaken.
【正确答案】 D
【答案解析】解析:句中词“accomplish”表示“实现,完成”。A项表示“贯彻,实行”;B项表示“给予,补偿”;C项表示“分配,指派”;D项表示“完成,使完善”。D项的意思与原文相符,所以应该选D。