摘要:45.[2010·河北唐山市二模]Subway Line 4. into use in September 2009.has made traveling in Beijing easier. A.having been put B.putting C.being put D.put 45D考查非谓语动词的用法.句意:2009年9月被付诸使用的第四条地铁使在北京的旅游更容易.Subway Line 4被使用.所以用过去分词.其相当于非限制性一个定语从句which was put into use in September 2009.

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