單項(xiàng)選擇題The quartermasters（）steer the ship and help the officer keep lookout.
A.duty
B.on duty
C.at duty
D.in duty
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1.單項(xiàng)選擇題The captain is in（）command of the ship.
A.overall
B.over
C.all
D.task
2.單項(xiàng)選擇題The officer of the watch（）a good lookout on the bridge.
A.keep
B.keeping
C.keeps
D.is keeping
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