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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】句意:虽然科学家已经了解到很多有关宇宙的知识,但是,对于我们来说,仍然还有很多未解之谜.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,故选c

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