I was told that there were about 50 foreign students        Chinese in the school, and most       were from Germany.

A．who were studying ; of whom

B．who study; of them

C．studying; of them

D．study; of whom

共同海损的牺牲主要是指财产的灭失或损害，包括（）。

A.船舶的牺牲

B.代替的费用

C.货物的牺牲

D.运费的牺牲