Zhengzhou Subway Line 1 which is 26.2 kilometers long       into trial operation (试运营) on December 26th, 2013. It has eased (缓解) the traffic pressure greatly.

  • A.put
  • B.was put
  • C.will put
  • D.is put

答案

正确答案:B

知识点:被动语态  动词时态:一般过去时  

解题思路

根据语境可知地铁是被投入试运营的,所以要用被动语态;由时间状语“on December 26th, 2013”可知时态应为一般过去时。所以答案选B。

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