问题
选择题
Look，so many passengers__________ with their smart phones on the underground．
A．played
B．will play
C．are playing
D．have played
答案
答案：C
句意：看，这么多乘客在地铁上正在玩手机．结合语境可知本句描述的是现在正在进行的动作，故用现在进行时态，选Ｃ．
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