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單項(xiàng)選擇題

（）tankers over 100 meters long must not proceed beyond Dongbei buoy.

A.Loading
B.Load
C.Lade
D.Laden

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單項(xiàng)選擇題

（）the canal transit, the radar was operating.

A.At
B.In
C.During
D.With

單項(xiàng)選擇題

（）the morning from 0800 to 1200 chief officer is on duty.

A.On
B.In
C.At
D.During