单项选择题

A life-buoy should be （）at the gangway door.

A. locate
B. located
C. locating
D. to locate

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单项选择题

A. have no time
B. in a minute
C. a long time
D. a short time

单项选择题

A. Stand at the gangway
B. Wait at the gangway
C. Get the gangway ready
D. Keep on the gangway

单项选择题

A. loading cargo
B. arrival in port
C. departure from port
D. unloading cargo