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    【题目】______to the Internet ,as many adolescents do ,will to some extent have a negative effect on their mental and physical health .

    A. Having been addicted B. Being addicted

    C. Addicted D. To be addicted

    【答案】B

    【解析】考查动名词作主语。句意：就像多数的青少年一样，沉迷于网络在某种程度上对他们的身心健康是有影响的。be addicted to“沉迷于……”，分析句子可知此处是动名词短语作主语，故答案为B。

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