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單項選擇題

The traffic lane（）suspended.

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

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單項選擇題

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

A.of
B.on
C.at
D.in

單項選擇題

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

A.from
B.of
C.off
D.over

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