◎ 题干
—How long _______it _______ you to work out such a difficult problem?
—About thirty minutes.
A. did… take                                      B. does… take                                  C. did…cost
◎ 答案
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◎ 解析
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◎ 知识点
    根据n多题专家分析,试题“ —How long _______it _______ you to work out such a difficult problem? —About thirty minutes. A. did… take B. does… take C. did…cost…”主要考查了你对  【日常用语、谚语】【情景交际】  等知识点的理解和应用能力。关于这些知识点的“档案”,你可以点击相应的链接进行查看和学习。