单项选择题
（）the incomplete nature of the survey ,heavy draught vessels warned not to navigate within the 10 fathom line.
A.Because
B.Owing to
C.Having been
D.Being
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（）the survivors known more of how to cope with cold water in the sinking of MV Titanic in 1912 countless lives（）.
A.Have/could have been saved
B.Have/could have saved
C.Had/could has saved
D.Had/could have been saved -
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Prior to entering a davit-launched life raft, you should make sure that（）.
A.the life raft is well ventilated of excess carbon dioxide
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A.nitrogen
B.Carbon dioxide
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