单项选择题
Continuous sounding of a fog whistle by a vessel is a signal（）.
A.that the vessel is anchored
B.to request the draw span of a bridge to be opened
C.of distress
D.that the vessel is broken down and drifting
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单项选择题
The Greek ship drifted and struck the portside of a Chinese ship，which（）the bulwalk and Stanchions.
A.caused damage to
B.had collision with
C.was damaging
D.was causing damage to -
单项选择题
The extent of the damage could not be（）though I inspected it with the Chief Stevedore in charge.
A.sure
B.contained
C.ascertained
D.applied -
单项选择题
The damage was caused（）the stevedores.
A.with
B.from
C.on
D.by
