Vessels are warned（）in the area enclosed by pecked lines owing to the existence of numerous telegraph cables.<br>A:anchor<br>B:to anchor<br>C:not to anchor<br>D:not to anchoring

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

出自：海船船员证

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