【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(xué)家已經(jīng)了解到很多有關(guān)宇宙的知識,但是,我們?nèi)匀徊恢赖倪有很多。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(zhuǎn)折。這里是轉(zhuǎn)折含義,故選C。

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