2. 外语
  3. Between 1852, when【C1】________was first established that Mount Everest was the highest mountain on earth, and 1953, when Edmund

Between 1852, when【C1】________was first established that Mount Everest was the highest mountain on earth, and 1953, when Edmund

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问题     Between 1852, when【C1】________was first established that Mount Everest was the highest mountain on earth, and 1953, when Edmund Hillary, and Tenzing Norgay finally reached the peak’s summit, it was every mountaineer’s dream to become the first person standing on the world’s【C2】________point. And George Mallory was one of the most tenacious early contenders.
    Mallory was introduced【C3】________rock climbing while studying at Winchester College.【C4】________completed his studies, he settled into a career【C5】________a teacher at Charterhouse School, and continued to pursue his passion【C6】________climbing in his spare time.
    Mallory’s【C7】________trip to Everest was a reconnaissance mission in 1921【C8】________ aimed to produce the first accurate maps of the region. Two【C9】________visits to the mountain followed. Then, on 8 June 1924,【C10】________his third attempt to reach the summit, Mallory and his partner, Andrew Irvine, disappeared.
    Several expeditions subsequently attempted to find the pair, and Mallory’s【C11】________was finally discovered in May, 1999, at 8,169 metres, 600 metres【C12】________the summit,【C13】________with various items of equipment, including handwritten letters to his wife, a pocket knife, an oxygen bottle and his goggles,【C14】________were later donated to the Royal Geographical Society【C15】________Mallory’s family.
    There is still considerable debate as to【C16】________Mallory reached Everest’s summit. The【C17】________that his goggles were found in his pocket has led some to suggest that he was on his way down the mountain【C18】________he fell. Had he been ascending in daylight, he would have been wearing the goggles to【C19】________snow-blindness, and given what is known of the pair’s climbing schedule, if it were【C20】________when they fell, they must have been on their way back down.
【C18】
选项
答案when
解析 本句意为“他是在下山的途中跌倒的。”所填的词语和“he fell”应构成时间状语从句，所以此空应填“when”。
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