A vessel not using a traffic separation scheme shall avoid it by as wide a（）as is practicable.

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• A vessel not using a traffic separation scheme shall avoid（）by as wide margin as practicable.

  A . them B . that C . this D . it

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• A vessel using a traffic separation scheme shall（）.

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• A vessel using a traffic separation scheme shall so far as practicable（）a traffic separation line or separation zone.

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