english problem[easy]Teenagers _____ their health because they play computer games too much填:have damaged、are damaging、damaged which one is correct?telll me why thank you

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english problem[easy]Teenagers _____ their health because they play computer games too much填:have damaged、are damaging、damaged which one is correct?telll me why thank you

english problem[easy]Teenagers _____ their health because they play computer games too much填:have damaged、are damaging、damaged which one is correct?telll me why thank you
english problem[easy]
Teenagers _____ their health because they play computer games too much
填:have damaged、are damaging、damaged
which one is correct?
telll me why thank you

english problem[easy]Teenagers _____ their health because they play computer games too much填:have damaged、are damaging、damaged which one is correct?telll me why thank you
B
首先要弄懂题意,题目的意思是由于青少年沉迷于电脑游戏,健康因此受到威胁,这个现象显而易见是一直持续发生的.现在我们来看各个选项的意思:
选A的话,have damaged是现在完成时,表示过去发生并且已经完成的动作对现在造成影响或后果,很明显不论是play computer 还是damage health 都还在继续,并没有“完成”,所以不选A
选C的话,过去时,表示过去某个时间里发生的动作或状态,还是不正确.
所以选B,现在进行时,表示动作发生的时间是“现在”,动作目前的状态是“正在进行中”.所谓“正在进行中”,是指在谈到这件事的时候,这个动作还在进行中.可能发生几年了,也可能只有几分钟.仍在进行中这是“正在进行时”的关键所在.它是一件持续进行的事情.所以选B

选第二个
是be+doing的结构

应该使用have damaged 。have damaged 表示青少年们已经损害了他们的健康由于玩了过多的游

选B表示现阶段青少年的状况。
现在进行时态表示最近或现在一直存在的状态