單項選擇題

The tide is（）.

A.black
B.setting
C.being
D.having

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單項選擇題

The traffic lane（）suspended.

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

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