單項(xiàng)選擇題It is the chief mate’s job（）the tank cleaning operation.
A.to plan
B.planning
C.for planning
D.in planning
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1.單項(xiàng)選擇題It is the only entrance（）the harbor for vessels of moderate draught.
A.to
B.for
C.on
D.over
2.單項(xiàng)選擇題Loading cargo operation in hold No.3 stopped owing to（）.
A.gangs employed
B.windlass trouble
C.gangs unavailable
D.shortage of navigational charts
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