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    18．What worried the mother most was __________ the Internet after class in this school．（　　）
    A．her son's not forbidding surfing
    B．her son's not being forbidden to surf
    C．her son's being not forbidden to surf
    D．her son's having not forbidden surfing

    分析 最使这位母亲焦虑的是她的儿子在这所学校里放学后没有被禁止上网．

    解答 答案：B 考查动名词复合结构．动名词复合结构是由物主代词或名词所有格加上动名词构成．动名词复合结构的否定式是在动名词前加not，排除C、D项，应分别在being和having前加not；只能从A、B项中选择；而son与forbid之间是动宾关系，要用动名词的被动形式，排除A项，只有B项正确．

    点评 此类问题的解答，首先要弄清楚独立主格结构与动名词复合结构的区别，然后根据题意选择正确答案．

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