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單項(xiàng)選擇題

The traffic lane（）suspended.

A.has
B.have
C.has been
D.have been

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The transmission of messages respecting the dangers specified is free（）cost to the ships concerned.

A.of
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The use of this rule does not relieve vessels（）their obligations to comply with the local laws.

A.from
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C.off
D.over

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