Teenagers________their health because they play computer games too much.
A．have damagedB．a(chǎn)re damaging
C．damagedD．will damage
B
B　[考查時(shí)態(tài)。句意：因?yàn)榍嗌倌觌娔X游戲玩得太多，所以他們正在損害自己的健康。由句意可知，青少年損害健康這一現(xiàn)象正在發(fā)生，故用現(xiàn)在進(jìn)行時(shí)。]
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