I don’t know if you noticed their absence or not，but we         .

  A．did      B．have      C．had            D．were

（山东省青岛市2007年高三教学第一次统一质量检测，英语，33）I don’t know if you noticed their absence or not, but we      .

A．did                            B．have                   C．had                     D．were