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    精英家教网 > 高中英语 > 题目详情
    You must observe and gather information like Nicolaus Copernicus ________ you want more career advancement opportunities.
    A．orB．becauseC．unlessD．if
    D
    这题考查连词的用法：句意是：你必须观察收集Nicolaus Copernicus的信息，如果你想要更多的事业进步机会。选D。
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