【題目】______ scientists have learned a lot about the universe, there is much we still don't know.

A. OnceB. SinceC. ThoughD. 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(shí)，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。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。本題考查讓步狀語從句。做狀語從句類的題目，需要理解句意，之后才能做出準(zhǔn)確的判斷。根據(jù)“we still don't know”可知，前后表示轉(zhuǎn)折含義，選項(xiàng)中只有though表示轉(zhuǎn)折。

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