Teenagers _____their health because they play computer games too much.
A．have damagedB．a(chǎn)re damaging
C．damagedD．will damage
B

試題分析:考查動詞時態(tài)。因?yàn)楹竺鎎ecause引導(dǎo)的狀語從句用一般現(xiàn)在時，所以排除C、D選項(xiàng)�，F(xiàn)在完成時表示已經(jīng)發(fā)生或完成的動作，而現(xiàn)在進(jìn)行時表示一直進(jìn)行的動作，從語境判斷在玩電腦游戲時，就一直在損害著自己的健康，所以B選項(xiàng)正確。句意：青少年在損害著自己的健康，因?yàn)樗麄兺嫣嗟碾娔X游戲。
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