Teenagerstheir health because they play computer games too much.A. have damagedB. are dama

问题补充：

Teenagerstheir 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：考查现在进行时态的用法。从句子后面的时态because they play computer games too much”可以看出，是“现在一直在做的动作”。