词汇与结构 The Pilot in Command (PIC) of an aircraft is the person aboard the aircraft who is ultimately responsible for its ____ and safety during flight.
A.
operation
B.
working
C.
maneuvering
D.
executing
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【简答题】A.After they receive 's degree. B.After they graduate from middle schools. C.After they receive bachelor's degrees. D.After general survey courses are completed.
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