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
单项选择题 A certificated lifeboatman assigned to command the lifeboat should（）.
单项选择题 （）is not convincing at all.
单项选择题 （）for many years，the AB passed the examination and became an officer.
