问题
单项选择题
A vessel not using a traffic separation scheme shall avoid（）by as wide margin as practicable.
A.them
B.that
C.this
D.it
答案
参考答案：D
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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
参考答案：D
