2. 公务员
  3. _____scientists have learned a lot about the universe, there is much we still don’ t know.

_____scientists have learned a lot about the universe, there is much we still don’ t know.

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问题 _____scientists have learned a lot about the universe, there is much we still don’ t know.
选项 A、Once
B、Since
C、Though
D、Unless
答案C
解析 句意：尽管科学家对宇宙已经了解了很多，我们不知道的还很多。分析句子可知，句子前后为让步关系，故选C。
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