单选题Distress traffic is the communication（）between the station in distress and the ships, aircraft, coast radio stations, coast earth stations and rescue centers participating in the rescue work.AexchangeBto exchangeCexchangingDexchanged
单选题
Distress traffic is the communication（）between the station in distress and the ships, aircraft, coast radio stations, coast earth stations and rescue centers participating in the rescue work.
A
exchange
B
to exchange
C
exchanging
D
exchanged
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