Playing too many computer games students.A. is bad toB. is bad forC. are bad toD. are bad

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A. is bad to
(答案→)B. is bad for
C. are bad to
D. are bad for
解析：be bad 后接to对某人态度不好；接for对……有坏处。句意：玩太多的电脑游戏对学生不好。本句主语是动名词短语，表示抽象动作，不可数，故谓语动词用单数。选B。