Teenagers their health because they play computer games too much.A. have damagedB. are dam

问题补充：

Teenagers their health because they play computer games too much.

A. have damaged

B. are damaging

C. damaged

D. will damage

答案：

A. have damaged

(答案→)B. are damaging

C. damaged

D. will damage

解析：

试题分析:考查动词时态。因为后面because引导的状语从句用一般现在时，所以排除C、D选项。现在完成时表示已经发生或完成的动作，而现在进行时表示一直进行的动作，从语境判断在玩电脑游戏时，就一直在损害着自己的健康，所以B选项正确。句意：青少年在损害着自己的健康，因为他们玩太多的电脑游戏。