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    【题目】 ______ scientists have learned a lot about the universe, there is much we still don't know.

    A. Once B. Since

    C. Though D. Unless

    【答案】C

    【解析】试题分析：句意：虽然科学家已经了解到很多有关宇宙的知识，但是，我们仍然不知道的还有很多。A一旦；B既然，自从；C虽然；D除非。once和unless表示条件，since表示原因或时间；though表示让步或转折。这里是转折含义，故选C。

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