问题
单项选择题
To become an officer on board, you must obtain（）.
A.an officer's license
B.an officer's promotion
C.an officer's statement
D.a seaman's book
答案
参考答案：A
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To become an officer on board, you must obtain（）.
A.an officer's license
B.an officer's promotion
C.an officer's statement
D.a seaman's book
参考答案：A