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问题285427
提问者：yingyingleaf	状态：本题老师已经讲解	提问时间：2006-4-23 18:29:00	价值：35
标题：选择题
正文
It was not until a strong base had been established in the Arctic . A. that they attempted to reach the North Pole B. did they attempt to reach the North Pole C. when they attempted to reach the North Pole D. then they attempted to reach the North Pole
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