单项选择题
A.wharf B.wharves C.wharve D.wharfs
The quartermasters（）steer the ship and help the officer...
单项选择题The quartermasters（）steer the ship and help the officer keep lookout.
A.duty B.on duty C.at duty D.in duty
The captain is in（）command of the ship.A.overallB.overC...
单项选择题The captain is in（）command of the ship.
A.overall B.over C.all D.task
The officer of the watch（）a good lookout on the bridge....
单项选择题The officer of the watch（）a good lookout on the bridge.
A.keep B.keeping C.keeps D.is keeping
