问题
单项选择题
The approval period for a shipboard Oil Pollution Emergency Plan expires after（）.
A.two years
B.three years
C.four years
D.five years
答案
参考答案：D
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The approval period for a shipboard Oil Pollution Emergency Plan expires after（）.
A.two years
B.three years
C.four years
D.five years
参考答案：D