单项选择题
Before （）the harbour, all derricks must be secured properly.
A.leave
B.leaved
C.to leave
D.leaving
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A.damage
B.damaging
C.damaged
D.All above. -
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The temperature in No.2 hold is below （）.
A.normal
B.norm
C.normally
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（）the track of hatch cover, please.
A.Cleaned
B.Clean
C.To clean
D.Cleaning
