teenagers _their health because they play computergames too muchA have damaged B are damaging C damaged D will damage 该选哪个呢?原因?

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teenagers_theirhealthbecausetheyplaycomputergamestoomuchAhavedamagedBaredamagingCdamagedDwilldamage该

teenagers _their health because they play computergames too muchA have damaged B are damaging C damaged D will damage 该选哪个呢?原因?
teenagers _their health because they play computergames too much
A have damaged B are damaging C damaged D will damage 该选哪个呢?原因?

teenagers _their health because they play computergames too muchA have damaged B are damaging C damaged D will damage 该选哪个呢?原因?
B are damaging,一种进行中的状态,暂时看不出结果

选B或者D都可以,最好是B
由于青少年玩太多电脑了,他们正在破坏自己的健康

选择A
这是一个完成时的题,从题的后半句是说因为他们玩了太多的的电脑游戏,可知已经有了结果,所以可知已经是完成时了
A是说青少年已经危害了他们的健康

B."由于青少年把太多的时间花在玩游戏上,他们的身体变得越来越糟糕。"