单项选择题

A qualified deck officer should be（）the watch.

A.in charge of
B.arranged
C.decided to
D.the depth of

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A certificated lifeboatman assigned to command the lifeboat should（）.

A.be the first individual to board the craft
B.drain the hydraulic pressure before lowering the craft
C.have a list of the persons assigned to the lifeboat
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（）is not convincing at all.

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（）for many years，the AB passed the examination and became an officer.

A.Having ignored him
B.To have been ignored
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