问题
单项选择题
Vessels should be manned（）duly qualified officers and crew adequate（）ensure the safety of navigation.
A.by/to
B.with/to
C.with/for
D.from/for
答案
参考答案：B
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Vessels should be manned（）duly qualified officers and crew adequate（）ensure the safety of navigation.
A.by/to
B.with/to
C.with/for
D.from/for
参考答案：B