Teenagers        their health because they play computer games too much.

A. have damaged  B. are damaging  C. damaged  D. will damage

 B 

解析：本題考查現(xiàn)在進(jìn)行時(shí)態(tài)的用法。從句子后面的時(shí)態(tài)"because they play computer games too much”可以看出，是“現(xiàn)在一直在做的動(dòng)作”。

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