We didn't know _________.[ ]

A. what are they shouting about

B. what they are shouting about

C. what they were shouting about

D. what were they shouting about

根据货物单元的特定形式在船上设置了经批准的系固系统的货物称（）

A.半标准货；

B.准标准货；

C.标准货；

D.非标准货。