The first edition ________ in 1955 and ________ a best seller ever since.    [ ]

A. was published; had been        

B. was published; has been

C. has been published; has been;    

D. had been published; had

以下哪项不是对业务演示区的要求（）

A、与监控中心其它区域分隔的独立空间

B、对外参观、演示过程中，不会影响集中监控区的正常工作

C、在演示区能够参观到整个集中监控区的全局

D、满足播放宣传片和幻灯片的需求