Nowadays，it is common to see people staring at their mobile phones instead of reading a real book，＿＿＿＿＿＿many experts are worried．
A．whenB．for whichC．whereD．a(chǎn)bout which
D

試題分析:句意：如今經(jīng)�？吹饺藗兌⒅麄兊氖謾C(jī)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。
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