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frequency/ approve/ independent/ prefer/ nickname / annual/ so far/ additionally / measure/ according toWe have completed half of the work____________.
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A metro system must be located below street level.( )
The world's first metro system was the partially underground Metropolitan Railway in London. ( )
Shanghai Metro, the world’s longest metro system, is the oldest metro system in China. ( )
The first line in Xi’an runs from east to west. ( )
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