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．a(chǎn)bout which

D

解析試題分析:句意：如今經(jīng)�？吹饺藗兌⒅麄兊氖謾C而不是讀真正的書籍，對此很多專家非常擔(dān)憂。在非限制性定語從句中be worried和介詞 about構(gòu)成短語，which指代前面提到的情況，所以選D。
考點：考查定語從句。

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