为什么饭后经常打嗝？

But for the fact that China   also affected by the global financial crisis, we      fewer unemployed workers now.

A．is; would have

B．were; would have

C．was; would have had

D．were; would have had

汉族的分布遍及全国各地，主要的分布地区以______和______最为集中．

双边投资保证协议为（）首创。

A.英国

B.法国

C.德国

D.美国

我国的广告学教育与研究，始于（）时期。