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【单选题】In the UK there are a variety of rail companies operating. As a result, if you are going for a long journey across the country, you may find that you not only have to change trains as you travel, but ...
A.
To call for the reduction of train fares.
B.
To advertise the rail transport in the UK.
C.
To introduce various rail companies in the UK.
D.
To give advice on one way of transport in the UK.