look so many passengers --- with their smart phones on the undergrounda\ played b\ will playc\ are playingd\ have played说理由!

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looksomanypassengers---withtheirsmartphonesontheundergrounda\playedb\willplayc\areplayingd\haveplaye

look so many passengers --- with their smart phones on the undergrounda\ played b\ will playc\ are playingd\ have played说理由!
look so many passengers --- with their smart phones on the underground
a\ played
b\ will play
c\ are playing
d\ have played
说理由!

look so many passengers --- with their smart phones on the undergrounda\ played b\ will playc\ are playingd\ have played说理由!
D are playing (现在进行时)
看,车站好多人带着行李在玩手机.

为你解答。
Look! So many passengers ( c\ are playing ) with their smart phones on the underground.
瞧!这么多人在地铁玩手机。
解释:开头的提示词look表明句子的动作是正在发生的,要用现在进行时态。

当然是C了,现在进行式,看,这么多的乘客在地铁上正在玩他们的手机。