【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】句意:雖然科學(xué)家已經(jīng)了解到很多有關(guān)宇宙的知識(shí),但是,對于我們來說,仍然還有很多未解之謎.A一旦;B既然,自從;C雖然;D除非。once和unless表示條件,since表示原因或時(shí)間;though表示讓步或轉(zhuǎn)折,故選c

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