单选题You must keep a gangway watch.（）A你必须值甲板班。B你必须接待来访者。C你必须值班。D你必须值舷梯班。
单选题
You must keep a gangway watch.（）
A
你必须值甲板班。
B
你必须接待来访者。
C
你必须值班。
D
你必须值舷梯班。
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