frequency/ approve/ independent/ prefer/ nickname / annual/ so far/ additionally / measure/ according toI know him, but we don’t ____________ see each other.
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frequency/ approve/ independent/ prefer/ nickname / annual/ so far/ additionally / measure/ according toWe have completed half of the work____________.
A metro system must be located below street level.( )
A. 对
B. 错
The world's first metro system was the partially underground Metropolitan Railway in London. ( )
A. 对
B. 错
Shanghai Metro, the world’s longest metro system, is the oldest metro system in China. ( )
A. 对
B. 错