單項選擇題

Vessels are advised（）clear of this area.

A.keep
B.keeping
C.to keep
D.to keeping

你可能感興趣的試題

單項選擇題

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

單項選擇題

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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