單項選擇題

A.a dredge and widen
B.dredged and widened
C.dredging and widening
D.being dredging and widening

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A.is holding course and speed
B.is turning to starboard
C.intends to pass port to port
D.will keep out of the way of the stand-on vessel

A.not under command
B.restricted in her ability to maneuver
C.engaged in towing
D.fishing