Which of the following is the worlds longest train tunnel, has started regular commercial rail service recently?

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Q: 17 (Current Affairs-DEC/2016)

Which of the following is the world’s longest train tunnel, has started regular commercial rail service recently?

question_subject: 

Geography

stats: 

0,87,52,87,28,16,8

keywords: 

{'longest train tunnel': [0, 0, 0, 1], 'beijing subway line': [0, 0, 0, 1], 'gotthard base tunnel': [0, 0, 0, 1], 'channel tunnel': [0, 0, 0, 1], 'seikan tunnel': [0, 0, 0, 2], 'regular commercial rail service': [0, 0, 0, 1], 'china': [1, 0, 1, 2], 'gbt': [0, 0, 0, 1], 'japan': [0, 0, 1, 2], 'switzerland': [9, 3, 9, 11]}