— When did you get home last Friday? 

— It was not until midnight ______ it was raining hard.  [ ]

A. when      

B. which        

C. before      

D. that

集中抄表终端数据采集必备的功能有（）

A.电能表数据采集

B.状态量采集

C.交流模拟量采集

D.直流模拟量采集