It___________we had stayed together for a couple of weeks  -_______________I found we had

a lot in common.   [ ]

A. was  until ; when                      

B. was  until ; that

C. was not until;when        

D. was not until;that

现况调查可以获得（）

A.发病率

B.患病率

C.相对危险度

D.特异危险度

E.以上都不是