--- Are you worried when your son often plays puter games? --- Yes. I think playing too many puter games ______ on teenagers.A.have a good effectB.has a good effectC.has a bad effectD.have a bad effect
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C解析根据题意我对玩电脑游戏对孩子产生影响是担心的,玩太多的游戏对青少年有害,故不选AB,玩电脑游戏是单数第三人称,故用has,故选C。