To become an officer on board, you must obtain（）.<br>A:an officer's license<br>B:an officer's promotion<br>C:an officer's statement<br>D:a seaman's book

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

出自：海船船员证

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