第四辑PART1的阅读里面的D选项第五行那里:without this ,managers will not be in a position to give appopriate advices,and when eventually the high-flyers do move on,new one will be needed to replace THEM.the next challenge will be to find a new generatin of high-flyers.想?问那个them指的是谁?是想说有抱负的人没有得到公司的发展帮助,自己进步后走了,新员工代替他们的位置,还是指有抱负的人取代了manager们?请尽量解释详细点,拯救学渣,不要只给个象征的答案啊