单项选择题
Vessels are required（）Singapore Port Service when passing the points indicated.
A.communicating with
B.to communicate with
C.be communicated
D.will communicate
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A.to not anchor
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Vessels carrying（）must not willfully wash decks or holds.
A.general cargo
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Vessels must be（）valid certificate of nationality or certificated of registry or license.
A.acquiring
B.with possession of
C.required for
D.in possession of
