--- Are you worried when your son often plays computer games?
--- Yes. I think playing too many computer games ______ on teenagers.
A．have a good effectB．has a good effect
C．has a bad effectD．have a bad effect
C
根據(jù)題意我對(duì)玩電腦游戲?qū)⒆赢a(chǎn)生影響是擔(dān)心的，玩太多的游戲?qū)η嗌倌暧泻Γ?br />故不選AB，玩電腦游戲是單數(shù)第三人稱，故用has，故選C。
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