6.English shall be used on the bridge as the working language for bridge-to-bridge and bridge-to-
shore safety _______.
(A)command
(B)working
(C)navigation
(D)communication
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統計: A(0), B(4), C(10), D(47), E(0) #1199747
統計: A(0), B(4), C(10), D(47), E(0) #1199747