Nowadays，it is common to see people staring at their mobile phones instead of re

题干

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

上一题下一题 0.64难度单项选择更新时间:2014-03-07 04:14:52

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