单项选择题

This mooring line is a little slack. Please （）it.

A.fast
B.fasten
C.slack away
D.slack

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单项选择题

Do you want the gangway adjusted （）or downwards?

A.up
B.on
C.high
D.upwards

单项选择题

The captain is not on（）.

A.aboard
B.board
C.boarding
D.ashore

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