單項(xiàng)選擇題Vessels are advised（）clear of this area.
A.keep
B.keeping
C.to keep
D.to keeping
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1.單項(xiàng)選擇題Vessels are warned（）in the area enclosed by pecked lines owing to the existence of numerous telegraph cables.
A.anchor
B.to anchor
C.not to anchor
D.not to anchoring
2.單項(xiàng)選擇題Vessels should not anchor or trawl in the vicinity of pipelines and are（）.in the pipeline area shown on the chart.
A.prohibit to anchor
B.prohibited to anchor
C.not to anchor
D.prohibited from anchoring
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