单项选择题
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
In the afternoon he often removes rust or（）some paint w...
单项选择题In the afternoon he often removes rust or（）some paint work.
A.do B.did C.does D.to do
