【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，我們?nèi)匀徊恢赖倪�有很多。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。這里是轉(zhuǎn)折含義，故選C。

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