问题
单项选择题
Vessels must be（）valid certificate of nationality or certificated of registry or license.
A.acquiring
B.with possession of
C.required for
D.in possession of
答案
参考答案：D
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Vessels must be（）valid certificate of nationality or certificated of registry or license.
A.acquiring
B.with possession of
C.required for
D.in possession of
参考答案：D