Young students-----their health because they play computer g

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Young students-----their health because they play computer games too much.
A,have damaged B,are damaging C,damaged D,will damage
为啥答案是B而不是其他三项,请给出的理由充分具体,

首先排除A和C,现在完成时和完成时都不符合语境.
be doing 表动作正在进行,表示马上发生,由于发生迅速,不能与任何时间状语连用,B并表示这件事情一定会发生
will do 指要做某事,将来时态,不一定
两者偏重点不同.相对于语境来说选B
再问： D表示将来有可能发生，题目中并没有表达出一定会发生的意思，只是他们玩电脑太多，将来有可能对他们有伤害，为什么不选D？而B是现在正在伤害，但是题目中because后面用的一般现在时，表示他们经常玩电脑，而如果选B就表示正在损坏他们的身体，好像说不过去，为啥要选B呢
再答：语法这东西呢，不能钻牛角尖。be doing 表动作正在进行，将来也会持续。玩电脑的同时是在伤害身体呀！选B更符合语境。如果按你的理解的话，都是一般现在时了，更应该选B了呀，

Young students-----their health because they play computer g Teenagers their health because they play computer games too Teengers() their health because they play computer games too Teenager——————their health because they play computer games Teenagers _____their health because they play computer games 1.Teenagers ______their health because they play computer ga teenagers____their health because they play computer games t teenagers _their health because they play computergames too he likes_____(play) computer games because they are exciting 改为被动语态：1.Students often play computer games 2.They will have Because They're Young 歌词 Some students use computer _____for their schoolwork.