-- I heard that there are a few seats left for tonight's show.
-- Really? I was under the impression ______ they were sold out a long time ago.
A:what
B:which
C:that
D:where
2013年1月22日,宝成铁路绵阳站新站全面投入运营。宝成铁路建成于( )
下列各句中无语病的一项是( )