参考答案:people are more mobile than ever before and perhaps this is why mobile phones have become so popular
答案解析:[注释] 本句翻译不难。首先是“比任何时候”的翻译使用句型“...than ever before”。其次,“流动,移动”翻译为mobile。
定语从句的谓语动词应与先行词的数一致,该定语从句所修饰的的先行词为any person,故A)项为正确答案。
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