Professor James will give us a lecture on the Western culture, but when and where _____ yet. [ ]

A. hasn't been decided

B. haven't decided

C. isn't being decided

D. aren't decided

在Inmarsat中采用存储转发报文方式的分系统是（）。

A、Inmarsat—F

B、Inmarsat—B

C、Inmarsat—C

D、Inmarsat—M