項(xiàng)目經(jīng)理負(fù)責(zé)的項(xiàng)目已經(jīng)滯后3個(gè)月時(shí)間,但是,奇怪的事,項(xiàng)目成本比預(yù)算成本低很多。項(xiàng)目經(jīng)理決定挽救工期,而又想避免返工。項(xiàng)目經(jīng)理應(yīng)該做什么?( ) A、趕工 B、快速跟進(jìn) C、重新界定范圍 D、資源水平