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全部科目 > 水路交通运输技能考试 > 海船船员考试 > 船舶管理(轮机专业) > 轮机英语 > 船舶电气与船舶安全

单项选择题

Christopher Columbus （） eighteen years （） planning for that wonderful voyage which he made across the Atlantic Ocean.

A.spends；in
B.spent；on
C.has spent；on
D.had spent；in

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