单项选择题
LAND-BASED AUTHORITY CONDUCTING AND CO-ORDINATING SEARCH AND RESCUE OPERATIONS IN A DESIGNATED AREA defines（）.
A.RCC
B.OSC
C.CSS
D.GPS
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单项选择题
When my ship arrived there，their ship（）.
A.has left already
B.left already
C.had left already
D.would left already
