The enormous loss of life on the Titanic was primarily caused by inadequate equipment, training and procedures. Passenger ship

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问题 The enormous loss of life on the Titanic was primarily caused by inadequate equipment, training and procedures.
  Passenger ships across the North Atlantic Ocean had had an excellent safety record in the ______.

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答案previous forty years

解析 参见文章第一段“...in the previous forty years on passenger snips on the North Atlantic crossing...”并在第五段也提到了这一点“...practices which had coincided with forty years of safe travel”。
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