We tried to find a table for seven, but they were all __________.  [ ]

A. given away        

B. kept away  

C. taken up          

D. used up

无线市话子网室外型10mWRP与10mW室内型基站内部结构相同，基站与天线采用（）Ω的同轴电缆连接。

A、20

B、30

C、40

D、50