Teenagers       their health because they play computer games too much.
A．have damagedB．a(chǎn)re damagingC．damagedD．will damage
B
考查現(xiàn)在進行時態(tài)的用法。從句子后面的時態(tài)"because they play computer games too much”可以看出，是“現(xiàn)在一直在做的動作”。
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