單項(xiàng)選擇題

Are there many（）and warehouses in the port?

A.wharf
B.wharves
C.wharve
D.wharfs

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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

單項(xiàng)選擇題

The captain is in（）command of the ship.

A.overall
B.over
C.all
D.task