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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。onceunless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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