Europe has achieved more in controlling the AIDS virus than Asia in the past ten years, ______ the

number of people infected with the virus is going up sharply. [ ]

A. when          

B. which          

C. that        

D. where

隋朝崛起北方，在灭（）、统一南北之后，便大力加强对南方的统治。

A.宋

B.齐

C.梁

D.陈