题目内容
Nowadays，it is common to see people staring at their mobile phones instead of reading a real book，＿＿＿＿＿＿many experts are worried．
| A．when | B．for which | C．where | D．about which |
D
解析试题分析:句意：如今经常看到人们盯着他们的手机而不是读真正的书籍，对此很多专家非常担忧。在非限制性定语从句中be worried和介词 about构成短语，which指代前面提到的情况，所以选D。
考点：考查定语从句。
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