Jack had traveled six miles across the channel ___________ his engine failed and was forced to land

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• Jack had traveled six miles across the channel ___________ his engine failed and was forced to land
• 新概念英语 第20课 语法提问In 1908 Lord Northcliffe offered a prize of $1,000 to the first man who would fly across the English Channel.On July 19th,1909,in the early morning,Hubert Latham took off from the French coast.' He had travelled only seven miles across the Channel when his engine failed and he was forced to land on sea.最后一句为什么是had travelled?和前后有什么逻辑关系么?
• Above the land and water _ with a depth from 50 to 200 miles.
• 1.Clouds hold water that evaporates from the land or the sea;the water in clouds returned to the land as rain or snow,