Question

（山東省青島市2007年高三教學(xué)第一次統(tǒng)一質(zhì)量檢測(cè)，英語，33）I don’t know if you noticed their absence or not, but we      .

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

Answer 1

A

解析:

but we did 是but we noticed their absence or not的替代式省略。