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【題目】 ______ 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】

試題分析:句意:雖然科學家已經了解到很多有關宇宙的知識,但是,我們仍然不知道的還有很多。A一旦;B既然,自從;C雖然;D除非。onceunless表示條件,since表示原因或時間;though表示讓步或轉折。這里是轉折含義,故選C。

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